Rock drill
United States Patent 2130982

Inventors:
Gartin, Elmer G.
Publication Date:
09/20/1938
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Assignee:
SULLIVAN MACHINERY CO
Primary Class:
91/470
Other Classes:
173/160, 92/137, 91/216R, 173/147, 92/151
International Classes:
E21B19/083; E21B19/084; E21B19/00