EARTH FORMATION UNDERREAMER
United States Patent 3443648
US Patent References:
/0494779.html
- - 0494779
Power transmitting device
- - 1841021
Underreaming apparatus
- - 1868702
Under reamer
- - 2809015
/0494779.html
- - 0494779
Power transmitting device
- - 1841021
Underreaming apparatus
- - 1868702
Under reamer
- - 2809015
Inventors:
Howard, Clarence E.
Publication Date:
05/13/1969
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Export Citation:
Assignee:
FENIX & SCISSON INC
Primary Class:
Other Classes:
175/96, 299/61, 299/71, 175/99, 175/267
International Classes:
E21B4/16; E21B4/18; E21B4/20; E21B10/32; E21B44/00; E21B4/00; E21B10/26; E21B5/00; E21B3/08; E21B1/06