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All Patents in class 464/163
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,259,852	Mar. 19, 1918	E.E. Greve	Rotary Drilling Apparatus
	1,259,855	Mar. 19, 1918	E.E. Greve	Rotary Drilling Apparatus
	1,679,825	Aug. 07, 1928	R.J. Holmgreen, J.H. Holmgreen	Rotary Well Drilling Machine

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