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Standards and conventions for mechanical drawing (1921)
Kepler, Frank Roy, 1875-, Detroit (Mich.). Board of Education · [Detroit] · leaf 29
BUTTRESS B&S WORM THD. CONVEiNTtONAL METHODS ta US.STD. THD.f^EIR /N. fO USSTD.r.THD. PER /N.Mechanical drawing
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