Bit
United States Patent 2990025
US Patent References:
Drill
- - 2203846

Drill bit
- - 2626128

Well drill
- - 2687875

Roller cutter for earth drills
- - 2774570

Cone type well drill
- - 2774571


Inventors:
Talbert, Milton L.
Scarborough, William E.
Publication Date:
06/27/1961
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Assignee:
Dresser, Ind
Primary Class:
175/375
Other Classes:
175/378, 175/426
International Classes:
E21B10/16; E21B10/52; E21B10/08; E21B10/46