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A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 62
newproblem without a working drawing having previously / •/ / // ^ X / \ / \ <\ 1 \ --^k/ T-</~V~ / 1 \ 1 ^ 1 / v II /V A \ 1 i \ i 1 1 • 1 V 1 i 1 \ p1 1\\1 1 1 1i / / / ; / // //i_ ^ / / / / \ • • // / /// \ Fig. 56 been made. No first-class foreman should permit anyother kind of a workman… … Fig. 57Mechanical drawing
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