Willy Watermann

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Dortmund-Berghofen, DT

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Patents Grantslast 30 patents

Information Patent Grant
Mine roof support for an underground mine gallery
- Patent number 4,056,941
- Issue date Nov 8, 1977
- Klockner-Werke AG
- Willy Watermann
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pit prop with liftable front end
- Patent number 4,041,715
- Issue date Aug 16, 1977
- Klockner-Werke AG
- Willy Watermann
- E21 - EARTH DRILLING MINING
Information Patent Grant
Excavation roof support
- Patent number 3,990,251
- Issue date Nov 9, 1976
- Klockner-Werke AG
- Karl Heinz Wehner
- E21 - EARTH DRILLING MINING