by means of power accumulators to be pre-charged by rock pressure

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Patents Grantslast 30 patents

Information Patent Grant
2985419
- Patent number 2,985,419
- Issue date May 23, 1961
- E21 - EARTH DRILLING MINING
Information Patent Grant
2888231
- Patent number 2,888,231
- Issue date May 26, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2888230
- Patent number 2,888,230
- Issue date May 26, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2872147
- Patent number 2,872,147
- Issue date Feb 3, 1959
- E21 - EARTH DRILLING MINING
Information Patent Grant
2753036
- Patent number 2,753,036
- Issue date Jul 3, 1956
- E21 - EARTH DRILLING MINING
Information Patent Grant
1964003
- Patent number 1,964,003
- Issue date Jun 26, 1934
- B66 - HOISTING LIFTING HAULING