Off-shore drilling apparatus
United States Patent 3179179
US Patent References:
/RE24083.html
- - RE24083

Hydraulic weight compensating apparatus for well bore devices
- - 2945677

Casing support
- - 3017934


Inventors:
Kofahl, David C.
Publication Date:
04/20/1965
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Assignee:
RICHFIELD OIL CORP
Primary Class:
166/352
Other Classes:
166/363, 166/358
International Classes:
E21B7/128; E21B7/12