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Mechanical drawing for industrial and high schools (1917)
Leeds, Charles Carley, 1870- [from old catalog] · New York, D. Van Nostrand company · leaf 66
Helix or Screw .2 Pitch -H … CLASi Indusfrial NAMcJonn V^. Roberts datc Feb. 6.07.Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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