by means of hydraulic devices

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Patents Grantslast 30 patents

Information Patent Grant
3012404
- Patent number 3,012,404
- Issue date Dec 12, 1961
- E21 - EARTH DRILLING MINING
Information Patent Grant
2997272
- Patent number 2,997,272
- Issue date Aug 22, 1961
- E21 - EARTH DRILLING MINING
Information Patent Grant
2677535
- Patent number 2,677,535
- Issue date May 4, 1954
- E21 - EARTH DRILLING MINING
Information Patent Grant
1924477
- Patent number 1,924,477
- Issue date Aug 29, 1933
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
1752101
- Patent number 1,752,101
- Issue date Mar 25, 1930
- E21 - EARTH DRILLING MINING