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All Patents in class 384/520
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	822,723	Jun. 05, 1906	R. Conrad	Ball-bearing
	1,622,880	Mar. 29, 1927	H.A. Perkins	Radial bearing
	2,696,569	Dec. 07, 1954	H.W. Schumann	Motor Tool

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