Rotary drill cutters
United States Patent 2927778

Inventors:
Coulter, John B.
Publication Date:
03/08/1960
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Assignee:
CHICAGO PNEUMATIC TOOL CO
Primary Class:
175/341
Other Classes:
175/374, 148/319
International Classes:
E21B10/16; E21B10/08
US Patent References:
2526489Method and apparatus for making drill bits
2533257Drill cutter
2669432Roller cutter
2687875Well drill
2774571Cone type well drill