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All Patents in class 74/406
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	297,383	Apr. 22, 1884	H. Hobbs, E.F. Gordon	Suspended drilling-machine
	1,684,344	Sep. 11, 1928	J.C. Carlton	Trasmission for Radial Drill Arms, Elevating Mechanism and Drill Spindles
	3,220,276	Nov. 30, 1965	E.C. Bruns	Position Analog Unit for Automatic Controls

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