Rock drill
United States Patent 3060894
US Patent References:
/0498742.html
- - 0498742

/0534812.html
- - 0534812

/0592115.html
- - 0592115

/1029082.html
- - 1029082

Air hammer
- - 1416086


Inventors:
Dean Jr., Robert C.
Boris, Auksmann
Publication Date:
10/30/1962
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Assignee:
INGERSOLL RAND CO
Primary Class:
173/133
Other Classes:
91/219, 173/135, 91/276, 173/212, 91/25, 173/170, 91/217
International Classes:
E21B1/30
US Patent References:
2072445Hair cutter for domestic animals
2400650Vibration apparatus
2679826Pneumatic tool
2748750Vibrationless pneumatic impact tool
2752889Percussion tool
2762341Pneumatic tools
2900959Pneumatic percussion tools
2906244Hydraulic pavement breaker
Foreign References:
DE355295C