Cat's Paw (Nail Puller)

Identity

• Names: "cat's paw" and "nail puller" are used interchangeably across trade and retail sources, but "cat's paw," "nail puller," "claw bar," "moulding bar" and "pry bar" overlap in retail language without being mechanically interchangeable [per the reviewer, relayed]. "Cat's claw" appears as a minor variant; the double-clawed form is also sold as a "claw bar," and a hybrid with one claw end and one flat pry end as a "moulding bar." Vaughan & Bushnell sells its own line as "Bear Claw." No dedicated foreign-language regional name was located; that is a search result, not a finding that none exists.
• Corpus definition (by working geometry and intended operation). A compact nail-extraction bar with a sharpened or tapered V-notch or cup-shaped claw that obtains purchase around a nail head or exposed shank, and a curved heel that acts as a changing fulcrum when the bar is rocked. Hybrid features (a second claw, a thin pry tip, a scraper, a hammer face, a strike plate) are model-specific variants, not part of every cat's paw. Patent classification: B25C11/00, nail, spike and staple extractors (from the original run's patent metadata).
• Family / category: a small hand tool for nail extraction. Some patterns are built to be hammer-set on a designated surface; others are non-struck pry bars. Which one a given bar is depends on the exact model and its maker.
• One-line: a bar whose sharpened claw is seated around a nail head or shank (on a struck model, by striking its designated surface; on a non-struck model, by hand pressure and positioning only) and then rocked back on its own curved heel to lever the nail out.
• Explicitly NOT: a claw hammer (whose claw is shallow and may not grip a deeply set or flush nail); a general demolition pry bar (a different scale of force, see the corpus's Pry Bar (Wrecking Bar) entry); a chisel (see how NOT to use it); a Halligan bar (a much larger forcible-entry tool with different geometry).

✦ How NOT to use it

• Not-for: general demolition prying or lifting (use a pry bar); heavy prying beyond the model's stated capacity; a cheater, pipe or other handle extension; a finish surface with a standard wide-head model.
• Not a chisel, stated correctly. The claw may be sharpened or beveled to penetrate wood, but it is not a chisel and should not be used for general cutting, splitting or material removal; the geometry, heat treatment and intended operation differ. Nail-driving, scraping and prying are model-specific combination features.

Dangerous: a safety procedure, not an absence of recalls. A recall search is a market-surveillance check and says nothing about the hazard of ordinary use. This tool is sharp, leveraged and, on struck models, struck. The foreseeable harms are eye injury from chips, fragments or a flying nail or shank; a struck or pinched hand; puncture or cut from the claw or a protruding fastener; a hammer miss; the claw slipping or jumping when a bar is not seated; loss of balance or a fall when a nail or the work suddenly releases; and damage to concealed services behind a surface.

Procedure (assembled from CCOHS and OSHA guidance read this pass and from the review; none of it names cat's paws specifically):

• Inspect the exact tool. Discard tools that are bent, cracked or chipped, and do not use struck tools with a chipped or mushroomed struck end; redress burred or mushroomed heads (CCOHS struck-tool guidance, read this pass). OSHA 29 CFR 1926.301(a) says "Employers shall not issue or permit the use of unsafe hand tools," and (c) requires impact tools such as drift pins, wedges and chisels to be kept "free of mushroomed heads" (read this pass; the section does not name cat's paws, and the application to this tool is by analogy). Check the claw, shaft, heel and any designated strike surface; remove from service if bent, cracked, chipped, loose or mushroomed. Check any wooden handle for soundness.
• Eye protection for the user, and protection for bystanders. CCOHS: safety glasses or goggles, or a face shield worn with them, and a screen or shield to protect fellow workers from flying chips.
• Strike only where permitted. Some struck nail-puller bars have a manufacturer-designated heel, poll or strike plate. Strike only that surface, squarely, with the striking tool the manufacturer specifies or permits [per the reviewer, relayed; the maker's pages read this pass give no striking-tool instruction]. Do not strike a non-struck pry bar, the shaft, the claw, or any mushroomed, chipped, bent or cracked surface. A hammer face on a combination model is a different feature from a strike plate. Controlled square blows only where permitted.
• Secure and support the work. Stable footing; do not overreach; a work piece that cannot shift. Stop if the work moves.
• Line of fire and hand position. Keep the holding hand and body out of the hammer path, the claw path, the lever path and the release path.
• Control the fastener. Expect a nail or shank to release suddenly or break; capture or control it, and watch for the protruding point once it is out.
• Know what is behind the surface before demolition work: concealed electrical, plumbing, glass or structural hazards [per the reviewer, relayed].
• Capacity and leverage. Do not add a cheater or pipe, and do not exceed the model's stated prying or fastener capacity.
• Stop and reassess if the claw slips, the tool deforms, or the work moves. Follow site and manufacturer requirements. ASME B107.410 (struck tools) incorporates the earlier nail-puller-bar and pry-bar standard; its public listing does not show the requirements and this entry does not state them [per the reviewer, relayed].
• Damaging: gouging or tearing wood by driving or seating the claw without a fulcrum block; snapping a small nail's shank while trying to keep the nail; using a broad standard-head model where a narrow or restoration model is needed.
• Beginner-trap: skipping the fulcrum block; seating the claw off perpendicular before the levering motion; reaching for a standard wide-head model on delicate trim; treating a non-struck bar as strikeable because other models are.
• Struck or not struck, by model. Some models are built with a designated flat striking surface; a standard forged claw-only bar may not be, and nothing here is permission to strike an undesignated edge. The rule is the model's instructions, not "check the model" as a fallback guess. Treating the tool as a full-size pry bar is a separate misuse: product sizing (most models well under 15") reflects a precision extraction scope, per Fine Homebuilding's comparison (original run).

Correct use

Read the maker's instructions for the exact model first. They decide whether the bar may be struck, where, and with what.

• Good at: nails with sunken, flush, broken-off or headless heads that a claw hammer cannot grip, in tighter spaces than a full-size pry bar reaches, where some local surface damage is acceptable or controlled.
• Technique (general sequence).
  • Inspect the bar and, on a struck model, its designated striking surface (see how NOT to use it).
  • Support the work and put on eye protection.
  • Position the claw against or around the nail head or exposed shank.
  • Seat the claw. On a model with a manufacturer-designated heel, poll or strike plate, strike only that surface, squarely, with the striking tool the manufacturer specifies or permits. On a model with no designated striking surface, do not strike it at all; use hand pressure and positioning, or choose a different tool.
  • Rock the bar back on its heel, or over a sacrificial wood block, to lever the nail partway out.
  • Finish the pull with a second tool where needed (for example a claw hammer), since a Fine Homebuilding article (read by the original run) says one pull with a cat's paw typically won't free a nail.
  • On a double-ended model, start with the shorter-curve claw and finish with the longer-curve one, the sequence Willhide's patent describes.
• Protecting the surface. A scrap block or shim under the bar spreads the load and prevents denting, named by multiple how-to sources.

✦ Matching

Matching depends on the exact model, the fastener, the material and how much surface damage is acceptable. It does not depend on the category name.

• Does: seats a compatible V-claw around an accessible nail head or shank and uses a curved heel as a fulcrum to lever the fastener out.
• Match on all of the following, not on the category.
  • Exact model, and whether it is rated to be struck and on which surface.
  • Fastener type (nail, brad, staple, spike, screw), diameter, head condition, embedment, corrosion and material. Nail sizes such as 6D–16D are product claims for particular models, not capacity rules; "by extension" use on staples or small spikes is not assumed and applies only if a model explicitly supports it.
  • Available clearance and pulling travel.
  • Workpiece support and material (softwood, hardwood, reusable stock, finished surface).
  • Acceptable surface damage. A broad struck claw intentionally digs into the surrounding wood. Where the visible face must survive, a purpose-built narrow or restoration puller, an end-cutting nipper, a pliers-type puller, a side puller, or pulling the fastener from the back is usually a better match [per the reviewer, relayed].
  • The manufacturer's prying and fastener capacity.
• Suits: nail extraction where local surface damage is acceptable or controlled, the work is supported, the fastener fits the exact claw, and there is room to strike or rock safely: demolition and deconstruction, salvage lumber, deck and flooring board replacement. Box/crate opening, scraping, staple removal, nail driving and hammer use only for products that explicitly support them. Careful trim work only with a model made for it.
• Not-for: unknown or energized concealed services behind the work; heavy structural lifting; screws, hardened or masonry fasteners and railroad spikes unless a model explicitly supports them; a finish face that must stay pristine when the claw must dig into it; striking a non-struck model.
• Pairs with: the striking tool the manufacturer specifies, only where striking is permitted; a sacrificial wood block or shim; eye protection; a second extractor, hammer or nipper when the model's travel is insufficient.
• Substitutes: a Claw Hammer for proud nails; end-cutting nippers or a pliers-style puller for controlled shank grip; a restoration or moulding bar, or a back-side pull, for finish work; a larger Pry Bar (Wrecking Bar) for general demolition leverage; a powered denailer only for its specified bulk-reclamation workflow. Locking pliers were suggested in forum comments for gripping an exposed shank; that is a practitioner tip and not a general recommendation, since they can mar the work or the fastener.
• Cannot replace: a full-size pry bar's leverage for structural demolition or lifting; a claw hammer on ordinary shallow nails.
• Access (corrected): technique-sensitive. The tool has sharp points and stored leverage and, on struck models, a struck face; a beginner needs the maker's instructions and the safety procedure below. An ordinary wide-head model used without a fulcrum block will damage the surrounding wood.
• Revival: inexpensive and satisfying for reclaimed-lumber and restoration work, where the question is whether a board can be salvaged.

Anatomy

• Claw/hook end(s): a V-shaped or cup-shaped tip, sharpened or tapered so it can enter wood around a nail. Double-ended models carry two heads of different curvature; Lee Valley's description of its model (read this pass): the straight end starts removing the nail and the curved "cat's paw" finishes the job.
• Heel: the curved heel provides a changing fulcrum when the bar is rocked. A sacrificial wood block under the heel changes fulcrum height, spreads bearing stress and may increase travel. It does not make the initial digging action non-marring [per the reviewer, relayed].
• Striking surface, model-specific.
  • Some models have a manufacturer-designated heel, poll or strike plate. Lee Valley's Japanese-made cat's paws have a flat back, and its page says the back "is flat so that the paw can be driven under a reluctant nail with a hammer" and is solid enough to strike directly (page read this pass; Lee Valley gives no safety instructions on that page).
  • Stiletto's 11.5-inch titanium claw bar page (read this pass) says its strike plate "outlasts steel bars by 3X and doesn't spall crack or mushroom like steel bars." That is a manufacturer claim. The page gives no use or safety instructions.
  • A separate hammer face on a combination model (for example the Restorer's Cat's Paw's small tack-hammer face) is a different feature, used for different work.
  • A bar with no designated striking surface is a non-struck pry bar.
• Shaft/stock: typically hexagonal, though round or rectangular exists. Vaughan's NP12DE and NP12G are listed as 5/8-inch hex tool steel (original run).
• Handle: bare forged-steel shaft is standard on the Vaughan and Estwing lines named; some ergonomic models have cushion grips.
• Sizes (product listings, not category claims). Estwing 8.375" to 14"; Vaughan Bear Claw roughly 8" to 11.75"; Lee Valley 6", 10.5" and 14", 4 oz to 25 oz (page read this pass).
• Capacity. Capacities are product claims. Stiletto's 11.5-inch bar is listed as pulling 6D–16D nails (page read this pass). Other tools and jaw patterns cover other sizes or staples.
• Steel/hardening: manufacturer copy says "tempered steel" or "drop-forged tempered steel." No manufacturer hardness figure was found; one secondary hardness range (about 50–54 HRC) could not be traced to a datasheet and is not used.

Trades

• Demolition and deconstruction: the core, best-documented use across sources.
• Framing carpentry and deck/flooring replacement: pulling fasteners driven flush or below the surface.
• Salvage and reclaimed-lumber work: preserving boards for reuse.
• General hardware/shipping trades (historical): box and crate opening, per Bridgeport's 1930 catalog as read by the original run.
• Restoration carpentry: narrow-tip and hybrid models only.

Lineage

Documented prior and related forms

This section lists documents that show related nail- and spike-extracting tools existed. It does not establish one continuous genealogy. Similar geometry, earlier dates, or appearing in a later patent's cited-by list prove relevance, not descent. Nothing below is called a direct ancestor; "descended from" is reserved for a demonstrated design, assignment, manufacturing or product genealogy, and none was found.

• Railroad-spike claw-bar precedents.
  • US 44,576 ("Improved Claw-Bar," Maxwell Cornelius, Cincinnati, October 4, 1864; read this pass): a bar with a head forming two hooked claws and a slot, giving a quadrant-like outline, with a fulcrum that moves as the head's contact point changes. This defeats any 1884 starting boundary for claw-bars; it is not claimed to be the first claw-bar.
  • US 307,544 ("Claw-Bar," James L. Hardwick, Cedar Rapids, granted November 4, 1884; read this pass): improves a railroad-spike claw-bar with a hardened-steel face-plate whose recessed corners form claws, and calls the end of the bar "an ordinary claw-bar for drawing railroad-spikes," which shows an ordinary form already existed. That earlier form was not itself located here. This is a railroad-spike tool, not a carpentry tool.
  • US 488,581 ("Claw-Bar," Myron W. Smades and John P. Ellstrom, granted December 27, 1892; read by the original run, not re-read here): describes a rounded "heel" giving "an easy rocking movement... which acts as a fulcrum" against tapering claw "toes" forming a V-slot. A long railroad-spike bar with the same fulcrum-and-notch idea.
• A mechanically distinct carpentry nail-extractor contemporary. US 474,698 ("Nail-Puller," Frederick G. Stark, granted May 10, 1892; original run): interpivoted jaws with sharpened ends adapted to enter the wood around an embedded nail head. It is framed as an auxiliary to an ordinary claw hammer. Interpivoted jaws are not the fixed claw of a modern cat's paw, so it is a contemporary, not an ancestor.
• An early double-ended fixed-claw analogue. US 795,876 ("Nail-Puller," Martin H. Willhide, Ingalls, Indiana; filed June 1, 1903, granted August 1, 1905; read this pass): a stock with two oppositely extending claws "of the usual hammer-claw form," one of shorter curve to start the nail and one of longer curve, used after reversing the tool, to finish the pull "without bending it." The page's citation list shows 21 later documents citing it, including several Nail Jack Tools and Michael J. Foley fastener-extraction patent publications (for example US 7,703,748 B2 and US 2011/0193036 A1). A later patent citing it as prior art shows patent relevance. It does not show that Nail Jack or any modern double-ended bar descended from it.
• A box and crate-opening hybrid. US 900,016 ("Nail-Puller," Willis F. Hobbs, assignor to Bridgeport Hardware Manufacturing Corporation, granted September 29, 1908; original run): double claws combining box-cover starting and straight nail extraction, with a hammer/fulcrum block. A combination tool; not evidence that the generic category had entered every listed trade.
• Living variations (model-specific, not a development line). Japanese-made narrow-tip cat's paws; the Restorer's Cat's Paw (a hybrid, see anatomy); pliers-style pullers such as the Nail Hunter and Nail Jack (a different mechanism; patents by Michael J. Foley / Nail Jack Tools, 2007–2014); Stiletto's titanium claw bar with a "Dimpler"; a pneumatic denailer for bulk reclaimed-lumber work, sourced only to Wikipedia and not corroborated here.
• Contemporaries documented elsewhere in this corpus (relationship only; internal links are for navigation, not independent evidence): the Claw Hammer; the Pry Bar (Wrecking Bar); the Halligan bar.

History

• The practical problem, stated as a function and not a story. A claw hammer's claw may not grip a nail driven flush, below the surface, or headless. Stark's 1892 patent frames his tool as an auxiliary to the claw hammer for that kind of nail. That shows a documented need and one patented response, not that cat's paws arose from it.
• Surface damage and later designs, as inference. Wikipedia says the rounded shape of the early extracting head "is so broad at its V-shaped notch opening that driving it into a board to capture a nailhead does significant damage to the wood." Narrow-tip Japanese-pattern bars and Stiletto's Dimpler address the same practical problem, getting purchase while limiting surface damage. This entry did not verify a direct development line or a stated design motive for either; no maker's dated primary source was found saying one was a response to the other.
• The name and the trademark record. The "Cat's Paw" name is repeated in Wikipedia and HandWiki as tracing to a 1952/1954 patent, sourced to one self-published book (Nail Pullers with Patent Reference, Raymond P. Fredrich, 2006) that was not accessed. The Justia trademark-record aggregator page (read this pass) shows no patent but a trademark: Registration 0592961, CAT'S PAW, filed December 13, 1952, registered July 27, 1954, first use August 1949 (day unspecified), owner C. Drew & Company, Inc., goods "hand tools for pulling nails and spikes" excluding tools adapted for or sold to the shoe-repair trade, status expired May 1, 1995 (renewal recorded July 27, 1974). That corrects the "patent" description of the record. It does not show who coined the tool name, when the lower-case generic term arose, or that the mark later genericized. The shoe-trade limitation may reflect coexistence with the older Cat's Paw rubber-heel mark (a different business, first produced 1904 per BrandlandUSA, not re-read), but the prosecution reason is unverified; the underlying USPTO documents were not obtained. Registration dates are trademark dates, not invention or naming dates.
• Research note, unverified anecdote. Wikipedia and HandWiki repeat, citing the same book, a claim that old wooden structures were sometimes burned to salvage hand-forged nails. It is single-sourced, not corroborated by a named archive or scholar, is not used to explain the tool's origin, and is left out of the history.
• Company histories, secondary. Bridgeport Hardware Manufacturing Corporation (founded 1895 by Willis F. Hobbs; advertised "Bridgeport Nail Pullers" in the December 1905 Hardware Dealers' Magazine and listed nail pullers in its 1930 catalog, per the Alloy Artifacts page read by the original run; later acquired by Crescent Niagara); Vaughan & Bushnell (1869, "Bear Claw" line); Estwing (1923). These come from secondary sources and are not tied here to named catalog, archival or patent documents, and founding history does not prove the history of any current model [per the reviewer, relayed].

Human side

• Trades. Demolition and deconstruction, framing carpentry, deck and board replacement, salvage and reclaimed-lumber work, historically box and crate opening, and restoration carpentry with narrow-tip or hybrid models. Multiple retail and how-to sources say standard wide-head models are not suited to finish-face work because the broad notch tears the wood around the nail head.
• Restorer's Cat's Paw (reviewed in Old House Journal; read by the original run). Described as combining a nail-pulling claw and small tack-hammer face on one end with a thin pry bar on the other; the reviewer describes pulling finish nails from the back of moulding as "much less destructive to the wood surface," and warns it is "strong enough to break the shank of smaller nails." Read as one product review's opinion.
• Named makers. Bridgeport Hardware, Vaughan & Bushnell, Estwing, C. Drew & Company (the trademark registrant), Stiletto Tools. Naming a maker is not a claim that it coined or invented the tool.
• User comments as recorded. ToolGuyd comments on the Nail Jack / Nail Hunter pliers-style puller (a different mechanism, not a cat's paw): "Trev," August 15, 2018, praised one he owned; "Owen," November 23, 2024, wrote that the jaws bent and blunted after a few years of use. They are single user comments and not tool-wide evidence.
• Museum record. None specific to a cat's paw or nail puller was found in this search. That is a search result, not evidence that none exists. An Estwing hammer lead is a different tool and is excluded.

Proof of existence

• Patent documents showing related forms (not a chain): US 44,576 (Cornelius, 1864, read this pass); US 307,544 (Hardwick, 1884, read this pass); US 488,581 (Smades & Ellstrom, 1892, original run); US 474,698 (Stark, 1892, original run); US 795,876 (Willhide, 1905, read this pass, 21 later citing documents listed); US 900,016 (Hobbs, 1908, original run).
• Trademark record: Registration 0592961 as above, via Justia, an aggregator; the authoritative route is USPTO TSDR, whose documents were not obtained.
• Current products: Lee Valley cat's paws and Stiletto's 11.5-inch claw bar (pages read this pass) show real model variation in strike surface, size and fastener range. Lee Valley's Restorer's Cat's Paws page and the Stanley 12-inch Precision Claw Bar page were not read this pass [per the reviewer, relayed].
• Museum: none found in this search (a search result only).
• Standard: ASME B107.410 (struck tools) is listed by ASME as incorporating the earlier nail-puller-bars-and-pry-bars standard; the full text was not read, so no technical requirement is claimed.

References

• {title: "Cat's paw (tool)", site: "Wikipedia", url: "en.wikipedia.org/wiki/Cat's_paw_(tool)", kind: reference}
• {title: "Cat's paw (nail puller)", site: "HandWiki", url: "handwiki.org/wiki/Engineering:Cat's_paw_(nail_puller)", kind: reference}
• {title: "US44576A — Improved Claw-Bar", author: "Maxwell Cornelius", site: "Google Patents", url: "patents.google.com/patent/US44576A/en", kind: patent, read: "this pass"}
• {title: "US307544A — Claw-bar", author: "James L. Hardwick", site: "Google Patents", url: "patents.google.com/patent/US307544A/en", kind: patent, read: "this pass"}
• {title: "US488581A — Claw-bar", author: "Myron W. Smades and John P. Ellstrom", site: "Google Patents", url: "patents.google.com/patent/US488581A/en", kind: patent, read: "original run"}
• {title: "US474698A — Nail-puller", author: "Frederick G. Stark", site: "Google Patents", url: "patents.google.com/patent/US474698A/en", kind: patent, read: "original run"}
• {title: "US795876A — Nail-puller", author: "Martin H. Willhide", site: "Google Patents", url: "patents.google.com/patent/US795876A/en", kind: patent, read: "this pass"}
• {title: "US900016A — Nail-puller", author: "Willis F. Hobbs, assignor to Bridgeport Hardware Manufacturing Corp.", site: "Google Patents", url: "patents.google.com/patent/US900016A/en", kind: patent, read: "original run"}
• {title: "US6923432B1 — Side nail puller", site: "Google Patents", url: "patents.google.com/patent/US6923432B1/en", kind: patent}
• {title: "Nail Jack / Nail Hunter fastener-extraction patents (US7703748B2 and siblings; US20110193036A1)", author: "Michael J. Foley, Nail Jack Tools Inc.", site: "Google Patents", years: "2007-2014", kind: patent, note: "listed as citing documents on the Willhide page; not individually read"}
• {title: "CAT'S PAW — Trademark Registration No. 0592961", owner: "C. Drew & Company, Inc.", site: "Justia Trademarks (aggregator)", url: "trademarks.justia.com/716/39/cat-s-paw-71639418.html", kind: trademark-record-aggregator, read: "this pass"}
• {title: "USPTO Trademark Search (authoritative route; documents not obtained)", site: "USPTO", url: "uspto.gov/trademarks/search/search", kind: government}
• {title: "What Happened to Cat's Paw Heels?", site: "BrandlandUSA", url: "brandlandusa.com/2010/01/01/what-happened-to-cats-paw-heels/", kind: reference}
• {title: "Bridgeport Hardware Manufacturing Corporation — company history", site: "Alloy Artifacts", url: "alloy-artifacts.org/bridgeport-hardware-mfg.html", kind: reference}
• {title: "Vaughan & Bushnell Manufacturing", site: "Wikipedia", url: "en.wikipedia.org/wiki/Vaughan_%26_Bushnell_Manufacturing", kind: reference}
• {title: "Nail Puller — product line", site: "Estwing", url: "estwing.com/product/nail-puller/", kind: manufacturer}
• {title: "Bear Claw nail pullers (BC8/BC10/BC12), NP12G, NP12DE — product listings", site: "Vaughan & Bushnell (via retailer listings)", kind: manufacturer}
• {title: "Cat's Paws (Japan-made, 6\"/10.5\"/14\")", site: "Lee Valley", url: "leevalley.com/en-us/shop/tools/hand-tools/pry-bars/41814-cats-paws", kind: retailer-product-page, read: "this pass"}
• {title: "Restorer's Cat's Paws", site: "Lee Valley", url: "leevalley.com/en-us/shop/tools/hand-tools/pry-bars/32014-restorers-cats-paws", kind: retailer-product-page, read: "not this pass"}
• {title: "Claw Bar — 11.5-inch titanium clawbar with Dimpler", site: "Stiletto Tools", url: "stiletto.com/11-1-2-inch-titanium-clawbar", kind: manufacturer-product-page, read: "this pass"}
• {title: "12-inch Precision Claw Bar", site: "Stanley", url: "stanleytools.com/product/55-115/12-precision-claw-bar", kind: manufacturer-product-page, read: "not read"}
• {title: "Tool Review: Restorer's Cat's Paw", site: "Old House Journal", url: "oldhouseonline.com/repairs-and-how-to/tool-review-restorers-cats-paw/", kind: review, read: "original run"}
• {title: "Pulling Stubborn Nails", site: "Fine Homebuilding", url: "finehomebuilding.com/project-guides/framing/pulling-stubborn-nails", kind: reference}
• {title: "What's the Difference: Demolition Tools", site: "Fine Homebuilding", url: "finehomebuilding.com/2015/05/13/whats-the-difference-demolition-tools", kind: reference}
• {title: "What Is a Cat's Paw?", site: "HomeTips", url: "hometips.com/how-it-works/cats-paw-nail-puller.html", kind: reference}
• {title: "Cat's Paw or Nail Puller", author: "Rob Robillard", site: "Concord Carpenter", url: "aconcordcarpenter.com/cats-paw-or-nail-puller.html", kind: reference}
• {title: "Nail Jack and Nail Hunter Nail Removal Tools (comment thread, Trev 2018 / Owen 2024)", site: "ToolGuyd", url: "toolguyd.com/nail-jack-and-nail-hunter-nail-removal-tools/", kind: forum}
• {title: "29 CFR 1926.301 — Hand tools", site: "OSHA", url: "osha.gov/laws-regs/regulations/standardnumber/1926/1926.301", kind: government, read: "this pass (paragraphs a–c)"}
• {title: "Hand Tools: Struck Tools", site: "CCOHS", url: "ccohs.ca/oshanswers/safety_haz/hand_tools/struck.html", kind: government, read: "this pass"}
• {title: "General Hand Tool Operation", site: "CCOHS", url: "ccohs.ca/oshanswers/safety_haz/hand_tools/general.pdf", kind: government, read: "not read; per the reviewer, relayed"}
• {title: "B107.60-2004 — Pry Bars", site: "ANSI Webstore / ASME", url: "webstore.ansi.org/standards/asme/asmeb107602004", kind: reference}
• {title: "B107.410 — Struck Tools (incorporation of B107.43, .44, .46, .48, .49, .50, .52, .59)", site: "ASME", url: "asme.org/codes-standards/find-codes-standards/b107-410-struck-tools-incorporation-asme-b107-43-b107-44-b107-46-b107-48-b107-49-b107-50-b107-52-b107-59", kind: reference, note: "listing only; requirements not exposed"}
• {title: "Pry Bar (Wrecking Bar); Claw Hammer; Nail Set (Nail Punch); Ripping Chisel; Titanium Hammer; Framing Hammer (Haft Tool Corpus sibling entries)", url: "internal corpus files, ", kind: internal-reference, note: "navigation and cross-reference only; not independent external evidence"}

The reviewer's corrections (9)

• BLOCKER — 1. Replace the “real, multi-patent chain” with documented prior and related forms — Exact claim: “Ancestors — a real, multi-patent chain, not inference,” followed by “the direct carpentry-tool ancestor,” “the closest ancestor to the modern double-ended form,” and “a real, traceable line from an 1905 design to a 21st-century commercial product.”
• BLOCKER — 2. Make every striking instruction model-specific and remove “mallet” as a generic pairing — Exact claim: The tool is “a bar driven around a nail head by a hammer blow”; correct use says to “drive it into the surrounding wood with a hammer blow”; Matching pairs it with “a claw hammer or mallet”; but Lineage-misuse says some models are deliberately strikeable while “a standard forged claw-only bar is …
• BLOCKER — 3. Rebuild the safety section; absence of recalls is not a hazard assessment — Exact claim: “this run found a genuinely low, largely checked-absence hazard record,” supported by no search-indexed CPSC recall and OSHA analogy.
• BLOCKER — 4. Make matching depend on fastener, material, geometry, and damage tolerance — Exact claim: The tool “extracts ... nails (and by extension staples and small spikes),” suits deck/flooring, crate opening, salvage, and careful trim with a narrow model, and is beginner-accessible; substitutes/pairings are stated for the category as a whole.
• SHOULD-FIX — 5. Correct the “no cutting edge at all” and driving language — Exact claim: A cat's paw is not a chisel because it has “no cutting edge at all,” and it is “not for ... cutting or driving,” while Lee Valley's cited combination models are described as pulling and driving nails and may be used as a hammer.
• SHOULD-FIX — 6. Downgrade the trademark-origin and collision story from fact to inference — Exact claim: C. Drew is “plausibly the true origin of ‘Cat's Paw’ as a proper-noun brand name that later genericized,” and the shoe-repair exclusion is “a real trademark-collision story, not folklore,” drafted to coexist with the Cat's Paw rubber-heel brand.
• SHOULD-FIX — 7. Remove causal redesign history that the sources do not establish — Exact claim: Broad early claws “drove the later narrow, pointed Japanese-pattern redesign” and Stiletto's Dimpler is “the same failure being solved twice, a century apart,” while the entry calls this a “genuine, two-stage form follows failure story.”
• SHOULD-FIX — 8. Remove or quarantine the building-burning nail-salvage story — Exact claim: “old wooden structures were sometimes deliberately burned to salvage the nails from the ashes,” characterized as “real, but single-sourced.”
• SHOULD-FIX — 9. Recalibrate confidence and checked-absence language — Exact claim: Confidence is “MEDIUM-HIGH,” supported by a “real, multi-patent chain,” “independently verified correction” to the name origin, multiple “checked absences,” and sibling-corpus corroboration.