Kei Watanabe

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Device for controlling a propagation direction of noise
- Patent number 4,158,401
- Issue date Jun 19, 1979
- Bridgestone Tire Company Limited
- Masayasu Matsumoto
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES