Combination roller cone and spark discharge drill bit
United States Patent 3158207
US Patent References:
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- - 2700131

Electric boring apparatus
- - 2822148

Electric flame boring apparatus
- - 2866622

Seismic shock source
- - 2898084

Earth boring drill
- - 2901223


Inventors:
Rowley, David S.
Publication Date:
11/24/1964
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Assignee:
JERSEY PRODUCTTION RES COMPANY
Primary Class:
175/16
Other Classes:
175/104
International Classes:
E21B10/08; E21B10/18
Foreign References:
CH147729A