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All Patents in class 173/42
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	249,130	Nov. 01, 1881	G.D. Whitcomb	Rotary mining-drill
	639,267	Dec. 19, 1899	W.T. Moss	Mining Machine
	1,273,733	Jul. 23, 1918	J.M. Calderwood	Drill Holder

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