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Mechanical graphics. An educational course on the theory and practice of mechanical drawing (1890)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The Princeton Press · leaf 13
X b . ^■1314151617 3|9 r^ -- 1 ; 2 ; 3 i 4 j 5 ; c 7 1 i 2 ! 0 j 4 5 1 2:3 1 2 3 ! 4 5 \ \ \ ,7Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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