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Appletons' cyclopædia of technical drawing (1896)
Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 558
ENGINEERING DRAWING. 541 … centers or side Door- - C(:nterS vf Svfing Hangers 4-5-Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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