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Standards and conventions for mechanical drawing (1921)

Kepler, Frank Roy, 1875-, Detroit (Mich.). Board of Education · [Detroit] · leaf 38

An illustration from Standards and conventions for mechanical drawing, 1921, leaf 38
CAST sr^SL … WROUGHT fRON

Mechanical drawing

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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