All Patents in class 464/163


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All Patents in class 464/163
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
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	well drilling machines