Title:
Well drill
United States Patent 1456681

Inventors:
Schepp, Albert J.
Schepp, Herman J.
Publication Date:
05/29/1923
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Assignee:
Schepp, Albert J.
Schepp, Herman J.
Primary Class:
175/98
Other Classes:
175/106, 175/102, 175/104
International Classes:
E21B4/04; E21B4/00