specially adapted for vertical or steep gradient seams

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Patents Grantslast 30 patents

Information Patent Grant
Multi-section non-pillar staggered protected roadway for deep incli...
- Patent number 10,989,051
- Issue date Apr 27, 2021
- Panshi Xie
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mineral mining installation
- Patent number 4,391,469
- Issue date Jul 5, 1983
- Gewerkschaft Eisenhutte Westfalia
- Yavier Arsuaga
- E21 - EARTH DRILLING MINING
Information Patent Grant
Roof support for a mine gallery which extends at a relatively large...
- Patent number 4,352,602
- Issue date Oct 5, 1982
- Bochumer Eisenhuette Heintzmann GmbH & Co.
- Kurt Plaga
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus for supporting a mine roof support assembly
- Patent number 4,324,510
- Issue date Apr 13, 1982
- Gewerkschaft Eisenhutte Westfalia
- Hans-Joachim Dreher
- E21 - EARTH DRILLING MINING
Information Patent Grant
Shield-type support assemblies for mine workings
- Patent number 4,075,857
- Issue date Feb 28, 1978
- Gewerkschaft Eisenhutte Westfalia
- Burckhardt Elsner
- E21 - EARTH DRILLING MINING
Information Patent Grant
3536433
- Patent number 3,536,433
- Issue date Oct 27, 1970
- E21 - EARTH DRILLING MINING
Information Patent Grant
3524321
- Patent number 3,524,321
- Issue date Aug 18, 1970
- E21 - EARTH DRILLING MINING