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Gunnar Lah
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Erzhausen, DE
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last 30 patents
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Patent Grant
Process for continuously lining a tunnel with extruded concrete
Patent number
4,820,458
Issue date
Apr 11, 1989
Hochtief AG Vorm. Gebr. Helfmann
Siegmund Babendererde
E21 - EARTH DRILLING MINING
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Patent Grant
Process and apparatus for continuously lining a tunnel with extrude...
Patent number
4,768,898
Issue date
Sep 6, 1988
Hochtief AG Vorm. Gebr. Helfmann
Siegmund Babendererde
E21 - EARTH DRILLING MINING
Information
Patent Grant
Method of and apparatus for the lining of a tunnel with concrete
Patent number
4,621,947
Issue date
Nov 11, 1986
Hochtief Aktiengesellschaft
Siegmund Babendererde
E21 - EARTH DRILLING MINING