Title:
Bit
United States Patent 2990025
Inventors:
Talbert, Milton L.
Scarborough, William E.
Publication Date:
06/27/1961
Export Citation:
Click for automatic bibliography generation
Assignee:
Dresser, Ind
Primary Class:
175/375
Other Classes:
175/378, 175/426
International Classes:
E21B10/16; E21B10/52; E21B10/08; E21B10/46
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US Patent References:
2774571Cone type well drill
2774570Roller cutter for earth drills
2687875Well drill
2626128Drill bit
2203846Drill