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All Patents in class 476/47
Patents 1 - 6 of 6
Picture	Number	Date	Patentee	Title
	7,322	Apr. 30, 1850	H. Elliott	Gearing for Regulating Speed
	644,591	Mar. 06, 1900	W.P. Freeman	Electric drill, &c.
	700,647	May 20, 1902	J. Hartness	Power Transmission Mechanism
	2,297,078	Sep. 29, 1942	F.W. Schlichter	Drill press
	2,423,323	Jul. 01, 1947	J.T. Janette	Variable-speed transmission
	2,961,899	Nov. 29, 1960	W.W. De Lano, J.E. Grove	Drilling machine

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