Well-boring apparatus
United States Patent 2105722

Inventors:
Barrett, George J.
Sosthene, Robichaux
Publication Date:
01/18/1938
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Assignee:
Barrett, George J.
Sosthene, Robichaux
Primary Class:
175/81
Other Classes:
166/117.600, 175/203, 175/392, 175/82, 166/55.300
International Classes:
E21B7/08