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All Patents in class 335/290
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	614,190	Nov. 15, 1898	O.S. Walker	Magnetic chuck
	1,544,695	Jul. 07, 1925	H.K. Spencer	Magnetic Holding Device
	1,595,691	Aug. 10, 1926	F.L. Simmons	Terminal Block for Magnetic Chucks and the Like
	1,604,323	Oct. 26, 1926	H.K. Spencer	Magnetic Holding Device
	4,402,032	Aug. 30, 1983	B.W. Wilterdink	Electromagnet Power Supply and Demagnetizer

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