Drill bit with driven auxiliary bit
United States Patent 2877988
US Patent References:
/2511831.html
- - 2511831

Full hole diamond bit
- - 2667334


Inventors:
Cameron, Harry M.
Wassel, Eugene S.
Publication Date:
03/17/1959
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Assignee:
AMERICAN COLDSET CORP
Primary Class:
175/319
Other Classes:
175/338, 175/376, 175/335, 175/434, 175/349, 175/344
International Classes:
E21B4/00; E21B10/14; E21B10/50; E21B10/08; E21B10/46