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Mechanical drawing; working drawings (1911)
Babbit, Arthur B · New York, H. Holt and company · leaf 181
Fig. 77 … An acute-angled tri-angle is one having thieeacute angles. See Fis;. 78. Fig. 7SMechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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