Title:
Rotary-drill extension
United States Patent 1414110


Inventors:
Bocchio, Charles S.
Application Number:
US42026320A
Publication Date:
04/25/1922
Filing Date:
10/28/1920
Assignee:
Bocchio, Charles S.
Primary Class:
Other Classes:
279/80, 279/105.1, 403/109.3, 403/327
International Classes:
B23Q1/70
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