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All Patents in class 173/37
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	5,951	Dec. 05, 1848	L.R. Bailey, J.T. Foster	Rock-Driller
	481,598	Aug. 30, 1892	W.X. Stevens	Rock-drilling machine
	1,252,374	Jan. 01, 1918	G.H. Gilman	Drilling Machine

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