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Standards and conventions for mechanical drawing (1921)
Kepler, Frank Roy, 1875-, Detroit (Mich.). Board of Education · [Detroit] · leaf 28
ne. / c^sr ^pur gbar ^,^M … Q ^._ j^o T DEPTH or COT 0.£636 ^^ ^^ ^F/G,a. CUT SPUR GEAR PLATE 12 27 SCREW THREADS h^1 ^^7 n It^r-^rMechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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