Motor driven well drilling apparatus
United States Patent 1880217

Inventors:
Simmons, Richard P.
Publication Date:
10/04/1932
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Assignee:
Simmons, Richard P.
Primary Class:
175/97
Other Classes:
175/106, 175/104, 173/79
International Classes:
E21B4/04; E21B23/02; E21B4/00; E21B23/00