Bark Spud

identity

• name: bark spud or peeling spud (preferred for the family); also debarking spud, peeling iron, peeling bar, bark spade; German Rindenspud / Rindeneisen ("barking iron") [BS1][BS2]. No single canonical name dominates.
• family/category: a long-handled bark-stripping hand tool. Its sharpened wedge or dished blade is driven or pushed between bark and wood, cutting or parting resistant fibres at its edge and lifting/prying the bark as the tool advances — cutting plus wedging, not one or the other [BS15][BS3][BS20][BS12]. The handle runs in line with the blade, unlike the drawknife's right-angle handles; that geometry is supported by the USDA illustrations and specifications, the Kuse museum object and current product pages [BS15][BS12][BS20][BS9].
• edge count is a pattern attribute: the USDA manual's illustrated pattern has three sharpened edges, and American Trails calls them three cutting edges [BS15][BS3]; Lee Valley's current Peavey-made spud is sharpened at the tip and sides [BS20]; the Wisconsin museum object has one sharp wedge/cutting edge [BS12]. "Dished," "curved," "flat," "single-edge" and "three-edge" describe patterns, not the family.
• one-line: A long-handled bark-stripping tool that cuts and lifts bark from felled logs as a fast first pass, sparing finer edge tools like the drawknife the grit embedded in skidded bark [BS8].

⚠ Naming collisions — checked and flagged, not conflated. The spud wrench (an ironworker's alignment wrench) [BS4a] and the spud bar (a steel digging/tamping bar) [BS4b] are unrelated tools; "spud bar" is occasionally used loosely for the bark tool, so the collision is real. "Tire spud" could not be substantiated as an established term and is not asserted.

how NOT to use it (the heaviest section)

not-for: fine finishing or smoothing (drawknife or bark knife) [BS3]; frozen bark, per one practitioner [BS14]; dormant-season hardwood without accepting an efficiency loss — one practitioner found the spud clearly best on sap-up pine and poplar and wondered whether a drawknife would be more efficient on his harder, off-season stock [BS14].

dangerous — rebuilt (review fixes 1 and 4).

• It is a cutting tool. The edges part bark fibres; they cut skin the same way. The USDA manual on its three-edge pattern: "Three sharpened edges make this tool unusually hazardous to use and transport. Be mindful of the blade when working or walking near others"; carry it "at your side. Grip the handle near the middle and walk with the cutting edges away from your body and down" [BS15]. American Trails: "Push the cutting edge away from your body and keep hands and feet, as well as other workers, away from the front of the blade" [BS3].
• Single-edge patterns are still sharp tools. Edge count changes where the edges are, not whether the tool cuts [BS12].
• Rolling log. A round log at working height must be positively restrained; the hazard is a fall or a crushed foot as much as a cut.
• Loose head or damaged handle: remove from service [BS15].
• Transport: sheath or cover the edges; do not carry tools loose in vehicles [BS15].
• PPE, contextual: eye protection, gloves that still permit a secure grip, sturdy footwear, and any site-required head or leg protection [BS15].
• Explicitly excluded: an SEO source's unsourced "OSHA 25% of logging injuries" and "NSC 8%" figures could not be traced to any primary source and are not used [BS22].

damaging: gouging into the wood beneath the bark is a plausible consequence of an over-driven stroke (inference, not a sourced incident). One black-cherry storage failure, kept as exactly that: a named forum practitioner (T. Pollock, Bushcraft USA, September 2024) debarked large cherry logs immediately after harvest, well before he planned to mill them: "All of the ones I peeled have dried too fast and have severe checking/cracking… Some of the cracks go as deep into the log as 2–6 inches… don't peel your logs till you're ready to use them" [BS14]. The mechanism is real — bark retards drying and surface checking, and uncontrolled drying can cause serious checks [BS32] — but the timing prescription is not a family-wide rule. Leaving construction logs barked can invite insects, stain and decay [BS30]. Plan peeling with storage and drying (see Correct use).

beginner-trap: treating season, or any single rule, as the whole answer. Peeling time is a storage-and-drying decision; tool choice depends on species, bark condition, knots and log stability as well as season.

lineage-misuse: treating the spud as a non-cutting pry bar (it cuts), or as a hatchet — one practitioner found a hatchet worked poorly on bark, "probably due to the thick profile" [BS14]. Do not borrow the girdling patent's blunt stripping component as a description of the ordinary spud [BS27], or the bark knife's handle sentence as spud evidence [BS3].

correct use

Before the first stroke — the safe-use sequence (the reviewer's safety notes, from the USDA manual's task and general-safety sections) [BS15]:

• Inspect the handle, socket/rivet, head and edges; remove a loose, cracked, mushroomed or damaged tool from service.
• Restrain the round log so it cannot roll or fall — a secure crib, stand or other positive anti-roll support — and establish secure footing with clear escape space. The manual's "hip height" setup never appears here without that support.
• Clear the blade's forward path and keep spacing from hands, feet and other workers.
• Use the direction and grip specified for the pattern; do not pull a three-edge spud toward the body.
• Stop if extra force, frozen bark, knots or a grain change cause loss of control; reassess tool and direction.
• Cover the blade for storage and vehicle transport (do not carry tools loose in vehicles); carry it at the side, as the manual directs.

Technique (USDA pattern). With the log restrained at a comfortable working height, grip the tool firmly with both hands, push the dished blade lengthwise along the log to slide it under the bark, and work away from the body [BS15]. If the bark tears or the edge goes jagged, reverse direction and peel toward a knot rather than forcing the original direction [BS8].

Timing. Many green, sap-up logs peel most easily, and the USDA manual pairs the spud with green logs [BS15]. Winter or dry bark may take more effort or another tool, but is not categorically ruled out (see History) [BS30]. Frozen bark: one German practitioner reports "You can't peel frozen bark like that" [BS14] — a single-source limit, LOW-MEDIUM.

Peeling time is part of the storage and drying plan. Choose when to peel as part of the complete plan: species, diameter, intended product, climate, airflow, cover, end sealing and time before sawing or construction all matter. Bark can retard checking, but it also retards drying and can shelter insects or decay [BS30][BS31][BS32]. For log construction, USDA Forest Products Laboratory guidance recommends peeling, stacking off the ground with free air circulation, sheltering from rain, and about six months of drying, and warns that unpeeled construction logs are very difficult to protect from long-term deterioration [BS30]; a Forest Service study of two Southeast Alaska house-log species found peeled indoor storage dried fastest and recommended 8–12 months for the conditions studied [BS31]. Valuable sawlogs may need end sealing, cool storage or other species-specific protection. Follow species- and project-appropriate log-storage guidance.

Sharpening. Maintain the pattern's original profile — a file and whetstone on each sharpened edge [BS15]. One contemporary maker keeps the edge slightly convex rather than chisel-flat, saying "the thick at centre cross section helps lift the bark away from the trunk" [BS19]; that is one maker's pattern, not a family rule. Gloves do not substitute for a sound handle and a controlled grip.

matching (the workbench's first read)

• does: strips bark from felled roundwood by cutting resistant fibres at the edge and lifting the bark as the blade advances; removes the bulk quickly as a first pass; clears grit-bearing bark ahead of finer edge tools or sawing [BS8].
• suits (core): bulk debarking of felled roundwood, especially many green, thick-barked, deeply furrowed or knotty logs; log structures; trail timbers [BS15][BS3]; post-and-beam / hewing preparation; sawmill preparation where grit-bearing bark must be removed [BS8].
• conditional: firewood, rustic poles, furniture stock, fence posts, and winter/dry logs — depends on species, storage plan, bark condition and desired finish.
• kit-fit: the spud → drawknife workflow is the most repeated in the trade sources [BS3][BS7][BS8]. With peavey/cant hook and log dogs for positioning and restraint. A drawknife can substitute on some logs; on skidded, grit-laden logs that risks the drawknife's edge [BS8]. Compare alternatives — drawknife, bark knife, powered debarker, water peeling, industrial debarker — by bark condition, finish, volume, access and hazard system. Powered alternatives are separate tools with their own instructions and controls.
• not-for (project-keyed): fine surface finishing or smoothing (drawknife or bark knife); shaping or flattening timber (adze/broadaxe); milled lumber with no bark; furniture-grade precision surface prep. Winter-cut or dry wood is no longer a categorical not-for — it is an efficiency limit: "Best on many freshly felled logs, often easiest in spring/early summer; winter or dry bark may require more effort or another tool, but is not categorically prohibited. Match the tool to species, bark condition, knots, log stability, and finish requirement."
• access: beginner-usable with instruction, not a casual first tool. A long, sharp tool driven forcefully along a round workpiece creates cut, fall, rolling-log and bystander hazards whether it has one edge or three. The safe-use sequence above is the entry gate.
• current_market_examples: Peavey Manufacturing (18-inch-handle spud) [BS9]; Lee Valley's 55-inch Peavey-made pattern (1¾-inch blade, 1⅛-inch socket, rivet, ash handle, sharpened tip and sides) [BS20]; GEDORE's OCHSENKOPF Black Forest, Daun, light and heavy bark-peeler patterns [BS25a]; Schroeder, Timber Tuff, SHW Forge and others [BS21][BS23][BS24].
• historical_continuity: two long-established forestry-tool makers currently list bark spuds. Peavey Manufacturing was founded in 1857 [BS9]; the OCHSENKOPF brand dates to 1781 [BS25b]. How long either has made a bark spud was not established — company age is not product-line provenance.
• revival: alive — current catalog sales and an organized log-building trade (International Log Builders Association, Great Lakes Log Crafters Association).

anatomy

• Blade. Hand-forged carbon steel, consistently described as "dished" or spoon/gouge-curved to follow the log's own curvature. Edge count varies by pattern: the USDA's illustrated pattern is sharpened at the tip and along both sides — three sharpened edges, which the Forest Service names as the hazard of that pattern [BS15]; Lee Valley's is sharpened at tip and sides [BS20]; the Kuse museum object has one cutting edge [BS12]. Commercial blade widths range roughly 1¾"–6" depending on model [BS9][BS19].
• Socket/ferrule. A tapered socket (commonly 1⅛") joins blade to handle, secured by a steel rivet. A contemporary UK blacksmith making the tool by hand notes a specific, deliberate design choice: the socket is not forge-welded shut, so that it functions as a spring, clamping onto the handle under working stress rather than being a rigid weld [BS19][BS20].
• Handle. Long and running in-line with the blade, not bent off at a right angle like the drawknife's. Traditional material is ash or hickory; budget commercial versions pair a steel body with a wood handle. Lengths in current production range from 18" (short, close-work models) to 55" (long-handled leverage models), with 3–4 ft the most commonly cited standard [BS9][BS15][BS21].
• Weight. Roughly 3½–4 lb for the head, or about 4 lb for the complete tool per the US Forest Service's own trail-work manual [BS15].

variations (living)

• Flat/straight vs. curved/dished blade — both forms remain in active commercial production; the curved (dished) pattern is more traditional and more common, built to follow log curvature; flatter blades exist for straighter work [BS22].
• Short vs. long handle, sold as distinct SKUs by the same makers — Peavey Manufacturing's 18" model ($88.39) versus the 55" Peavey-made spud sold through Lee Valley; Schroeder Log Home Supply sells a 45"/5"-cut "Large" and a 25"/3"-cut "Small," both hand-forged and made in the USA [BS9][BS21][BS23].
• Regional patterns, confirmed as real, currently-sold products, not historical speculation:
  • Bavarian (Germany) — SHW Forge's "Bavarian-Style Bark Spud with Curved Edge," ash handle, 140mm blade / 1200mm handle, sold in the US at $85 explicitly "for forestry professionals and homesteaders alike" [BS24].
  • German — Ochsenkopf ("Ox Head"), a brand founded 1781 (company founding, not a product-line date) [BS25b], now part of the GEDORE Group, whose current range lists Black Forest, Daun, light and heavy bark-peeler patterns [BS25a]. A US importer lists two weight classes — Light (400g) and Heavy (550g), a head-weight sizing convention distinct from the North American handle-length convention [BS25].
  • Austrian — a "Muller Barking Spade (Spud)" listed by a US retailer, price only confirmed via search (page content itself was not independently fetchable this run — flagged) [BS26].
  • Swedish — a named "Original Swedish EIA-BELI Debarking Iron" carried by a long-established (~80-year) German forestry retailer alongside German and Austrian models ("Daun," "Black Forest," "Österreich," "Widderkopf") — real, current evidence that distinct regional/blacksmith naming traditions are still commercially alive across Germany, Austria, and Sweden [BS16].
  • A primary maker's own account of the two design families: a contemporary UK blacksmith explicitly frames his standard product as "based off of various Scandinavian examples" (short and broad), with "the western style long and thin kind... made upon request" — a working toolmaker's own confirmation that North American/Western and Scandinavian patterns are recognizably different traditions, not just cosmetic branding [BS19].
• A different, adjacent practice — flagged, not conflated. A claim surfaced that Sámi tradition strips bark from living trees in vertical strips for food/craft use, via a different technique and purpose than felled-log debarking. This was not independently verified by direct primary-source fetch in this run and is named as an unconfirmed lead for a future entry, not a fact of this one.
• Powered and industrial alternatives — see Lineage (not descendants).

trades (where it appears)

Log-home building; forestry; US Forest Service and other trail-maintenance work [BS15]; the historic hemlock/tanbark trade of the American upper Midwest [BS12]; firewood processing and homesteading; rustic pole-furniture making. Current German, Austrian and Swedish patterns are evidenced by a live regional retail catalog [BS16] rather than a documented historical trade record.

lineage

Ancestors. No source names a specific ancestor artifact. Trade-history and forum sources describe the tool as often improvised by rural blacksmiths from scrap steel — "the most popular was probably just a buggy spring with a sharpened end" [BS5]; a forum practitioner's blacksmith father "made something similar" [BS6]. That is a real strand of the tool's history; it is not proven to be the origin, and the patent record below shows the tool also entered the patented-invention record.

An early patented variant. US1086993A, "Bark-stripping tool," Anton Camanada, filed 1913, granted 1914 — a hand tool with a handle socket and paired curved blades with cutting edges; the edges enter the bark and the tool is rocked and advanced to pry bark from a log [BS29]. It is plainly a dedicated hand tool for stripping bark from logs. This search did not establish the first bark spud, or a direct line from Camanada's paired-blade design to current single-head patterns.

Contemporaries / siblings.

• Drawknife — the spud removes the bulk and the grit; the drawknife finishes clean [BS3][BS7][BS8]. The USDA manual pairs them by condition: "Use a bark spud to peel green logs"; drawknives "work best to peel dry logs" [BS15].
• Bark Knife — a separate tool in the same American Trails article, for smoothing rough bark rather than removing it [BS3]. American Trails' in-line-handle sentence is about the bark knife, not the spud, and is not used as spud evidence here.
• Peavey & Cant Hook — log-rolling and positioning tools used alongside. Peavey Manufacturing Co. also sells a bark spud today [BS9].
• Adze and broadaxe — the next tools in a log-building sequence, hewing an already-debarked log [BS7].
• Coa de jima — a Mexican agave-harvesting tool named by Wikipedia as functionally analogous; no lineage asserted; single tertiary mention, LOW [BS1].
• Adjacent compound tool: US2760307A (Tiblom, filed 14 July 1953, granted 28 August 1956) is a standing-tree girdling device with separate sharp cutting components and a relatively blunt stripping component [BS27]. Kept only as an example of a compound tool separating cutting and lifting functions — not evidence for the ordinary spud's edge profile, and not lineage.

Powered and industrial alternatives (not descendants — shared function does not establish technological descent). The Log Wizard chainsaw-bar attachment ($269.95 as listed at the Run 313 check, 2026-07-17) [BS10]; pressure-water peeling (500–1,000 psi standard, 2,000–4,000+ psi with a rotating nozzle, per one retailer's how-to) [BS10]; angle-grinder debarking discs [BS10][BS11]; industrial drum/rosser-head debarkers (general industry knowledge, not sourced here). The chainsaw and grinder systems are separate tools with their own manufacturer instructions, guards, PPE, dust, kickback and training requirements, not casual pairings with a hand spud.

history (Petroski lens — what failure did each evolution fix?)

No single point of origin is established. What can be dated:

The tanning-industry bark trade, Taylor County, Wisconsin, 1880s–1920s. Hildegard and Loretta Kuse, descendants of settlers who moved to Medford, Wisconsin in 1883 "at the start of the tanning boom," wrote up a specific bark spud held by the Kuse Farm Museum & Nature Preserve for a University of Wisconsin public-history project. Bark peeling was seasonal farm-family income, done in spring; a dated photo, "Hemlock peelers from Rib Lake, ca. 1900," is credited to the Rib Lake Historical Society. A later wave — "peeling popple" (aspen) for paper companies — ran through the 1960s–70s. The object is described as having one cutting edge [BS12].

The patent record, 1914. Camanada's US1086993A documents a dedicated bark-stripping hand tool for logs [BS29] (see Lineage).

Log driving. Sweden's timmerflottning and Finland's tukinuitto long histories, and the last major US whitewater drive (Clearwater River, Idaho, 1971), are reported by a tertiary source [BS13]. Shortened and held LOW as spud history: the link between debarking and snag reduction in log driving is an inference in this draft, not independently sourced, and is not needed to establish the tool.

★ Form follows failure — what the spud is for. Mother Earth News: "Many logs are skidded over rough terrain and this can embed dirt and bits of rock in the bark. Trying to peel logs like this with only a drawknife will result in, at best, a very dull blade, or at worst, a damaged blade…" and "using the spud before you begin to use the drawknife will save you time and energy in the long run and save sharpening time on your drawknife blade" [BS8]. The spud does fast bulk removal on grit-laden bark so a finer edge downstream is spared. (The earlier claim that its blade is "designed to tolerate dullness" is withdrawn as unsourced; a spud has sharpened edges and is maintained sharp [BS15].)

Timing — an efficiency variable, not a prohibition. Many species peel most easily freshly felled, while the cambium is active, commonly in spring and early summer [BS5][BS8][BS12][BS14]. But season is not the only variable: USDA Forest Products Laboratory guidance says winter peeling is more laborious but may provide enough fungus/insect protection to justify the extra work in log construction [BS30], and a Forest Service log-construction manual (named in the review, not separately linked there) says peelability varies by species and recommends bark spuds especially for thick-barked, deeply furrowed or knotty logs. Graded MEDIUM for broad seasonal/species performance: several of the converging sources are secondary, commercial or forum accounts, and American Trails may share institutional knowledge with the USDA manual rather than being fully independent.

human side

Traditions & trades. This tool belongs to several overlapping, real trades rather than one: the historic hemlock/tanbark-peeling trade of the American upper Midwest (seasonal farm income, now extinct as an industry but documented in family and museum records) [BS12]; the modern log-home-building trade, where "professional log peelers" are named as a distinct, physically demanding job [BS7]; US Forest Service trail-maintenance crews, for whom the spud is standard-issue for debarking green logs in trail structures [BS15][BS3]; the historic log-driving trade ("river pigs," "shantymen"), whose downstream need for smooth, unsnagged logs gave debarking its economic purpose [BS13]; and European — especially German, Austrian, and Swedish — forestry and log-building traditions, evidenced today by a still-active regional retail catalog of named local blacksmith-pattern tools rather than by a documented historical guild record [BS16].

Named hands and real trade testimony. A Bushcraft USA forum thread, "Log De-Barking/Peeling Advice?" (started by user T. Pollock, March 2024, 79+ posts across three months), carries genuine, dated, first-person testimony:

• T. Pollock, the thread's author, gives a direct, honest, real-time efficiency comparison by wood species and season: "If I were cutting logs when the sap was up and cutting pine or poplar logs I think the spud would be the most efficient tool to use. With the species I normally use (ones that don't peel as easily) though and cutting them all when the sap is down, I'm now wondering if a draw knife wouldn't work more efficiently for me" [BS14].
• Buck Fynn (a long-tenured forum member) describes his blacksmith father forging a home-made debarking tool and a shin adze, and a two-stage technique: an initial vertical pass, then a rest period of about a month (species-dependent) before a horizontal finishing pass — real inherited trade technique, not printed guidance [BS14].
• kelly1, from British Columbia, states a real ergonomic counter-preference: "I think a draw knife is best, especially the heavy ones that will have a little momentum, much easier on the body" [BS14].
• WoodGnome, a German forum member (Swabian Jura), names the German term "Rindenspud" directly and adds a real, specific limitation: "This works always — only exception is: You can't peel frozen bark like that" [BS14].

A folk-invention story, held at reduced confidence. A secondhand account (via a permies.com forum post, itself citing a since-unverified Farm Show magazine article) describes a named individual, Ralph Thibault, building a debarking tool from "a big metal grapefruit peeler fused to an axe head" — genuine folk-invention texture, but this entry could not independently verify the underlying magazine article and flags the attribution as secondhand rather than confirmed [BS17].

Institutional trade record. B. Allan Mackie founded a dedicated log-building school (near Prince George, BC, 1974) and co-authored Building With Logs (1971, 100,000+ copies across six printings) — a well-documented, real institution and book. This research could not directly fetch the book's own text to confirm its specific treatment of the peeling spud, so that detail is flagged as an unverified secondhand characterization; the school and book's existence and prominence are independently well-evidenced [BS18].

Stories. The strongest piece of human texture is current — see "damaging" below for one maker's black-cherry storage failure, kept as one account, not a rule. Honest gap: no historical Scandinavian craft-guild account or named period practitioner was found — only a modern German forum voice and a contemporary European retailer's regional product-naming, which is real market evidence but not the deep historical trade record the tool's long European use would suggest exists somewhere.

proof of existence

Patents. US1086993A, "Bark-stripping tool," Anton Camanada, filed 1913, granted 1914 — a dedicated hand tool for stripping bark from logs [BS29]. Adjacent, standing-tree girdling devices, not the felled-log hand tool: US2760307A (Tiblom / A B Odelberg & Olson, filed 14 July 1953, granted 28 August 1956) [BS27] and US2693028A ("Tree girdling spud," Stoddard, filed 1952) [BS28]. The search record surfaces other bark-stripping patents as well. Patent absence is no longer used as evidence of folk origin.

Museum record. The Kuse Farm Museum & Nature Preserve (Medford, Wisconsin) holds a specific, photographed bark spud with family provenance, written up for Wisconsin 101, with the dated photograph "Hemlock peelers from Rib Lake, ca. 1900" (Rib Lake Historical Society) [BS12]. Patten Lumbermen's Museum and the Moosehead Historical Society's Lumbermen's Museum hold general logging-tool collections; a bark spud was not confirmed in either in the Run 313 search.

Current commercial record. Several makers and resellers currently list bark spuds [BS9][BS20][BS25a][BS21][BS23][BS24]. This proves present availability, not continuous production since any firm's founding.

Archaeology. No archaeological example was identified in the repositories and terms searched on 2026-07-17 (general web and museum-collection searches for "bark spud" / "peeling spud"). That is a bounded search result.

references

(Reference kind: book | video | blog | forum | reddit | museum | patent | named_maker | manufacturer | trade_press | retailer | vendor_blog | archaeological | government)

The reviewer's corrections (11)

• BLOCKER — 1. Correct the defining cutting-versus-prying mechanism — Exact claim: The family field defines the bark spud as having “a blunt-tolerant lifting blade rather than a cutting edge,” and the identity says it is used to “pry bark away from the wood rather than cut it off.”
• BLOCKER — 2. Replace the universal “do not peel until ready to use” rule — Exact claim: The entry turns a forum user's cherry-log experience into the beginner rule “don't peel your logs till you're ready to use them,” saying early debarking “can ruin valuable wood on its own.”
• BLOCKER — 3. Correct the patent search result and the origin inference built on it — Exact claim: “No dedicated patent for this specific hand tool was found,” “this specific hand tool never generated” a dedicated patent, and the absence “corroborates” a folk/blacksmith origin.
• SHOULD-FIX — 4. Make the three-edge hazard pattern-specific and complete the safety system — Exact claim: The entry treats “three sharpened edges” as the defining hazard of the bark-spud family and reduces first-timer controls to working away from the body, gloves, eye protection, and carrying edges down.
• SHOULD-FIX — 5. Change winter/dry wood from “not-for” to a qualified efficiency limit — Exact claim: The matching section lists “winter-cut, dry, or fully seasoned wood” under “not-for,” and “Timing is the whole game.”
• SHOULD-FIX — 6. Stop claiming centuries of continuous production of this exact tool — Exact claim: Peavey and OCHSENKOPF are said to provide “continuity of production spanning 150–240+ years” and “a living, unbroken production record” for “this exact tool.”
• SHOULD-FIX — 7. Fix the American Trails quotation attributed to the spud — Exact claim: The entry uses American Trails' sentence “A draw knife has handles at a right angle to the blade whereas a bark knife's handles are in line with the blade” to corroborate the bark spud's defining handle geometry.
• SHOULD-FIX — 8. Do not transfer a girdling patent's blade rationale to the ordinary spud — Exact claim: US2760307A's “relatively blunt” stripping blade is used to confirm why the bark spud's blade avoids sapwood damage and to formalize its cutting/prying distinction.
• SHOULD-FIX — 9. Reclassify source convergence and lower confidence — Exact claim: Five mixed sources are treated as independent convergence sufficient for HIGH confidence on seasonal timing, while the overall entry is MEDIUM-HIGH.
• MINOR — 10. Replace “descendants” with alternatives at other scales — Exact claim: Chainsaw attachments, water peeling, angle-grinder discs, and industrial debarkers are called the bark spud's “descendants.”
• MINOR — 11. Scope negative-search claims and repair reference specificity — Exact claim: “No archaeological evidence was found,” two museums are treated as checked negatives, and several references use grouped or incomplete links.