Title:
Method and apparatus for drilling oil wells
United States Patent 1900163


Inventors:
Drexler, Dana
Morgan, Frank A.
Application Number:
US53448131A
Publication Date:
03/07/1933
Filing Date:
05/02/1931
Assignee:
Drexler, Dana
Morgan, Frank A.
Primary Class:
Other Classes:
175/61
International Classes:
E21B7/04; E21B7/06; E21B7/08; E21B7/136
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