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All Patents in class 173/39
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	5,951	Dec. 05, 1848	L.R. Bailey, J.T. Foster	Rock-Driller
	147,402	Feb. 10, 1874	S. Ingersoll	Improvement in rock-drills
	RE6,292	Feb. 16, 1875	S. Ingersoll	Improvement in machines for drilling rock
	396,018	Jan. 08, 1889	C.M. Woolworth	Drilling-machine
	1,279,532	Sep. 24, 1918	G.H. Gilman	Drilling Apparatus

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