Drag bit
United States Patent 3145790
US Patent References:
Well bit
- - 1923488

Resiliently coupled drill bit
- - 2740651

Drill bits
- - 3066750


Inventors:
Bridwell, Harold C.
Rowley, David S.
Publication Date:
08/25/1964
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Assignee:
JERSEY PROD RES CO
Primary Class:
175/425
Other Classes:
76/108.100, 175/413
International Classes:
E21B10/54; E21B10/46