Rock drilling apparatus
United States Patent 2614808
US Patent References:
Rock drill
2338625

Portable drill rig
2217674

Drilling apparatus
2123897

Portable drilling rig
2104341

Portable drilling rig
2094588


Inventors:
Curtis, John C.
Miller, Earl E.
Publication Date:
10/21/1952
Export Citation:
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Assignee:
JOY MFG CO
Primary Class:
173/193
Other Classes:
173/37
International Classes:
E21B15/00
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US Patent References:
1754348Power tool
1371344Shoveling and loading machine