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Appletons' cyclopædia of technical drawing (1896)
Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 927
Elliptic Spring apjplied to Car Truck. Bolster Spring. 874 SCRAPS. … Third Avenue Elevated Railroad.Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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