Fumio Kondoh

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Osaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Easily-cuttable tunnel segment structure
- Patent number 7,004,679
- Issue date Feb 28, 2006
- Nippon Steel Corporation
- Ryoichi Naka
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Easily-cuttable tunnel segment structure
- Publication number 20030113168
- Publication date Jun 19, 2003
- Ryoichi Naka
- E21 - EARTH DRILLING MINING