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All Patents of Type: well drilling machines
Patents 1 - 2 of 2
First set of recordsLast set of records
367,783Aug. 09, 1887J.S. BrownWell Drilling and Piping Machinewell drilling machines
1,679,825Aug. 07, 1928R.J. Holmgreen, J.H. HolmgreenRotary Well Drilling Machinewell drilling machines
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