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Patents Grantslast 30 patents

Information Patent Grant
Hydraulic support unit and hydraulic support for anti-rock burst ro...
- Patent number 10,774,642
- Issue date Sep 15, 2020
- Liaoning University
- Yishan Pan
- E21 - EARTH DRILLING MINING
Information Patent Grant
3544055
- Patent number 3,544,055
- Issue date Dec 1, 1970
- E21 - EARTH DRILLING MINING
Information Patent Grant
2857125
- Patent number 2,857,125
- Issue date Oct 21, 1958
- E21 - EARTH DRILLING MINING
Information Patent Grant
2816728
- Patent number 2,816,728
- Issue date Dec 17, 1957
- E21 - EARTH DRILLING MINING
Information Patent Grant
2721051
- Patent number 2,721,051
- Issue date Oct 18, 1955
- E21 - EARTH DRILLING MINING
Information Patent Grant
1784116
- Patent number 1,784,116
- Issue date Dec 9, 1930
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
1450603
- Patent number 1,450,603
- Issue date Apr 3, 1923
- E21 - EARTH DRILLING MINING