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Information Patent Grant
Apparatus for protecting roof tray when gob-side entry retaining en...
- Patent number 10,822,949
- Issue date Nov 3, 2020
- China University of Mining and Technology
- Jianbiao Bai
- E21 - EARTH DRILLING MINING
Information Patent Grant
Travelling bracket
- Patent number 4,487,531
- Issue date Dec 11, 1984
- Bochumer Eisenh/u/ tte Heintzmann GmbH & Co. KG
- Ernst-G/u/ nter Nerlich
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine roof support
- Patent number 4,311,417
- Issue date Jan 19, 1982
- Fletcher Sutcliffe Wild Limited
- Lewis R. B. Bower
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mineral mining installation
- Patent number 4,227,833
- Issue date Oct 14, 1980
- Gewerkschaft Eisenhutte Westfalia
- Karl-Heinz Plester
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine roof supports
- Patent number 4,139,325
- Issue date Feb 13, 1979
- Fletcher Sutcliffe Wild Limited
- Lewis R. Bower
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pit prop with liftable front end
- Patent number 4,041,715
- Issue date Aug 16, 1977
- Klockner-Werke AG
- Willy Watermann
- E21 - EARTH DRILLING MINING
Information Patent Grant
3159003
- Patent number 3,159,003
- Issue date Dec 1, 1964
- E21 - EARTH DRILLING MINING