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Patents Grantslast 30 patents

Information Patent Grant
Method and device for installing a shaft lining in shafts through a...
- Patent number 4,401,397
- Issue date Aug 30, 1983
- Gewerkschaft Walter
- Albrecht Sommer
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for sinking shafts
- Patent number 4,107,930
- Issue date Aug 22, 1978
- Gewerkschaft Walter
- Theodor Thiehofe
- E21 - EARTH DRILLING MINING

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