Title:
Well drilling apparatus
United States Patent 2883156

Inventors:
Davenport, Howard D.
Publication Date:
04/21/1959
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Assignee:
Davenport, Howard D.
Primary Class:
175/100
Other Classes:
175/107
International Classes:
E21B4/02; E21B4/00
US Patent References:
2663541Hydraulic motor
2684835Apparatus for drilling well boreholes
2776817Drilling apparatus
Foreign References:
GB755207A