Heinrich Grotenhofer

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Krefeld, DE

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Patents Grantslast 30 patents

Information Patent Grant
Process and device for lining tunnels and ducts having circular and...
- Patent number 5,171,105
- Issue date Dec 15, 1992
- Gebr. Eikhoff Maschinenfabrik u. Eisengiesserei mbH
- Heinrich Grotenhofer
- G02 - OPTICS
Information Patent Grant
Tunnel-driving and support system
- Patent number 5,076,729
- Issue date Dec 31, 1991
- Gebr. Eichoff Maschinenfabrik
- Heinrich Grotenhofer
- G02 - OPTICS
Information Patent Grant
Bracing device for a self-advancing shield tunnelling machine
- Patent number 5,051,033
- Issue date Sep 24, 1991
- Gebr. Eickhoff Maschinenfabrik und. Eisengieberei mbH
- Heinrich Grotenhofer
- E21 - EARTH DRILLING MINING