Drill bit
United States Patent 3100545
US Patent References:
Detachable drill bit
- - 2233421

Drill bit
- - 2890021


Inventors:
Zimmerman, Robert D.
Publication Date:
08/13/1963
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Assignee:
INGERSOLL RAND CO
Primary Class:
175/419
Other Classes:
279/96, 403/334, 175/426
International Classes:
E21B10/38; E21B17/04; E21B10/36; E21B17/02