Hydraulic impact tool
United States Patent 3004523
US Patent References:
/1050287.html
- - 1050287

Rock drill
- - 1429786

Valve for rock drills
- - 1711811

Hydraulic cylinder and control means therefor
- - 2232514


Inventors:
Christensen, Sheldon L.
Publication Date:
10/17/1961
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Assignee:
Christensen, Sheldon L.
Primary Class:
173/133
Other Classes:
279/19.500, 91/298, 173/170, 173/138
International Classes:
B25D9/14; B25D9/00