Title:
Drill
United States Patent 2110397

Inventors:
Francis, Kangas
Publication Date:
03/08/1938
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Assignee:
Francis, Kangas
Primary Class:
403/326
Other Classes:
279/76, 403/355, 403/361, 411/516, 403/360, 403/378, 81/177.850
International Classes:
E21B17/046; E21B17/02