Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 262
Fig. 292. Actual Proportions.Hexagonal Head—U. S. StandardBolts and Nuts Fig. 293. Conventional Repre-sentation. Hexagonal Head—U.S, Standard Bolts and Nuts
Mechanical drawing
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