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Appletons' cyclopædia of technical drawing (1896)
Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 926
u-|; \<-55-->k--5/0-)i<- 55X e6=:----->^-4ff-^-4S--)K- 4//-:M- 4/0-->K^- 6s --■A24k-4e-> «^-f-«#-: 27i k- vs-^i ->1 K-— /O 3 —^ ^ ^ N^ to Class 6 From the Engineering News.* … Elliptic Spring apjplied to Car Truck. Bolster Spring. 874 SCRAPS.Mechanical drawing
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