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Practical problems in mechanical drawing and blueprint reading (1921)
Sturtevant, Walter W. [from old catalog] · Minneapolis, Minn. : Practical problems co. · leaf 41
^ 4^/^y> ^//Zl -/J a 8£ 39 9i … /| /6 THPS. 5AE. 6TC>Blueprints · Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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