Drilling apparatus
United States Patent 2588068
US Patent References:
/1285712.html
- - 1285712

/1295320.html
- - 1295320

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- - 1663014

Earth boring apparatus
- - 1932068


Inventors:
Ernest, Williams
Bogdanowski, John W.
Publication Date:
03/04/1952
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Assignee:
CONS EDISON COMPANY OF NEW YOR
Primary Class:
175/122
Other Classes:
175/325.500, 175/78, 74/842, 173/36, 175/207, 175/62, 175/171, 175/279
International Classes:
E21B7/20; E21B10/34; E21B10/26