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All Patents in class 279/65
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	243,093	Jun. 21, 1881	J. Watson	Bit-stock
	246,513	Aug. 30, 1881	F.W. Ireland	Bit-brace
	1,288,154	Dec. 17, 1918	C.A. Palmgren	Drill-chuck
	2,172,070	Sep. 05, 1939	C.A. Palmgren	Chuck
	2,479,973	Aug. 23, 1949	E.A. Allen, F.P. Healy, J.Y. Scott	Chuck

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