Guenter Fennel

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Burghaun, DE

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Patents Grantslast 30 patents

Information Patent Grant
Roller bit for tunnel-driving machines with segmented cutting rings
- Patent number 6,343,842
- Issue date Feb 5, 2002
- Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik
- Klaus Dieter Sauer
- E21 - EARTH DRILLING MINING