Diamond bit
United States Patent 2174980

Inventors:
Heath, Clarence L.
Sherwood, Ellsworth B.
Publication Date:
10/03/1939
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Assignee:
J K SMIT & SONS INC
Primary Class:
175/405.100
Other Classes:
164/333, 76/108.100
International Classes:
E21B10/48; E21B10/46