Clemens Versteegen

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Essen, DE

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Patents Grantslast 30 patents

Information Patent Grant
Form for concrete-placement tunnel lining
- Patent number 4,856,936
- Issue date Aug 15, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Process and apparatus for lining a tunnel with concrete
- Patent number 4,854,776
- Issue date Aug 8, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING