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All Patents in class 464/163
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,259,852Mar. 19, 1918E.E. GreveRotary Drilling Apparatus
1,259,855Mar. 19, 1918E.E. GreveRotary Drilling Apparatus
1,679,825Aug. 07, 1928R.J. Holmgreen, J.H. HolmgreenRotary Well Drilling Machinewell drilling machines
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