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Alfred Bollmann
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Bochum, DE
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last 30 patents
Information
Patent Grant
Walking prop for mine tunnels
Patent number
5,190,414
Issue date
Mar 2, 1993
Strebtechnik Bochum GmbH & Co.
Hans-Ferdinand Bemmerl
E21 - EARTH DRILLING MINING
Information
Patent Grant
Mine roof support
Patent number
4,309,131
Issue date
Jan 5, 1982
Bochumer Eisenhutte Heintzmann GmbH & Co
Alfred Bollmann
E21 - EARTH DRILLING MINING
Information
Patent Grant
Arrangement for controlled engagement of the tools of a mining mach...
Patent number
4,280,734
Issue date
Jul 28, 1981
Bochumer Eisenhuette Heintzmann GmbH & Co.
Gunter Blumenthal
E21 - EARTH DRILLING MINING
Information
Patent Grant
Mine roof support
Patent number
4,252,477
Issue date
Feb 24, 1981
Bochumer Eisenhutte Heintzmann GmbH & Co
Alfred Bollmann
E21 - EARTH DRILLING MINING