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Iron One

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object

Iron One

A named craft tool / part lemma (Iron One) drawn as an exact public-domain workshop phrase.

Iron One is historically related to Iron.
gunsmith-manual seats orphan iron-one beside iron as a first craft peer — object speech, not a text-container or tradition dump.
from J. P. Stelle & William B. Harrison · The Gunsmith's Manual, PD Gutenberg #71928
historically related to · sourced · documented

sources

The Gunsmith's Manual · J. P. Stelle & William B. Harrison
Stelle & Harrison, The Gunsmith's Manual (PD Gutenberg ed.).