Peter Marr

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Bochum, DT

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Patents Grantslast 30 patents

Information Patent Grant
Breast roof support system for longwall mining
- Patent number 4,094,153
- Issue date Jun 13, 1978
- Bochumer Eisenhutte Heintzmann GmbH & Co.
- Gunter Blumenthal
- E21 - EARTH DRILLING MINING
Information Patent Grant
Roof prop apparatus and method for longwall mining
- Patent number 4,094,154
- Issue date Jun 13, 1978
- Bochumer Eisenhutte Heintzmann GmbH & Co.
- Gunter Blumenthal
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for advancing and supporting an underground mi...
- Patent number 4,077,670
- Issue date Mar 7, 1978
- Bochumer Eisenhutte Heintzmann GmbH & Co.
- Klaus Spies
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pit prop assembly
- Patent number 4,008,578
- Issue date Feb 22, 1977
- Bochumer Eisenhutte Heintzmann & Company
- Gunter Blumenthal
- E21 - EARTH DRILLING MINING