Title:
Drilling equipment
United States Patent 3244242


Inventors:
Wolff, Paul A.
Application Number:
US5706660A
Publication Date:
04/05/1966
Filing Date:
09/19/1960
Assignee:
KERR MCGEE OIL IND INC
Primary Class:
Other Classes:
175/85, 405/201
International Classes:
E21B15/00
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