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

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