All Patents in class 72/146


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All Patents in class 72/146
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	475,299	May 24, 1892	C.J. Colling	Machine for bending sheet metal
	3,145,759	Aug. 25, 1964	A.D. Swartz, H.A. Doster, C. Zelnick	Apparatus for making power springs