Well drilling bits
United States Patent 2867413
US Patent References:
/1326506.html
- - 1326506
Rotary well drill
- - 1535572
Means for forming a well bore
- - 1587266
Drilling apparatus
- - 1775774
Drill
- - 2011158
/1326506.html
- - 1326506
Rotary well drill
- - 1535572
Means for forming a well bore
- - 1587266
Drilling apparatus
- - 1775774
Drill
- - 2011158
Inventors:
Olsen, Ole K.
Publication Date:
01/06/1959
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Assignee:
Olsen, Ole K.
Primary Class:
Other Classes:
175/426
International Classes:
E21B10/54; E21B10/46
US Patent References: