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All Patents in class 173/97
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	1,252,374	Jan. 01, 1918	G.H. Gilman	Drilling Machine
	1,252,375	Jan. 01, 1918	G.H. Gilman	Drilling Apparatus
	2,919,901	Jan. 05, 1960	R.L. Sandvig	Drill system with suction
	3,269,466	Aug. 30, 1966	W.G. Mitchell	Impact tool

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