Kazuyuki Yamamoto

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Control signal transmission system for key telephone system
- Patent number 4,551,583
- Issue date Nov 5, 1985
- Telegraph & Telephone Pub. Corp.
- Koichi Sekiguchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Synchronization system for key telephone system
- Patent number 4,314,109
- Issue date Feb 2, 1982
- Iwasaki Tsushinki Kabushiki Kaisha
- Koichi Sekiguchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Speech channel switching networks suitable for use in combination w...
- Patent number 4,292,476
- Issue date Sep 29, 1981
- Nippon Telegraph & Telephone Public Corporation
- Kazuyuki Yamamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE