All Patents in class 173/150


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All Patents in class 173/150
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	249,130	Nov. 01, 1881	G.D. Whitcomb	Rotary mining-drill
	4,062,412	Dec. 13, 1977	W.A. McIlvanie	Flexible shaft drilling system