Yoshiro Hasegawa

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Kamakura, JP

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Patents Grantslast 30 patents

Information Patent Grant
Telephone circuit
- Patent number 6,671,375
- Issue date Dec 30, 2003
- Hitachi, Ltd.
- Takeshi Fukuju
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Switching matrix equipment having a series circuit of relay coil an...
- Patent number 4,231,017
- Issue date Oct 28, 1980
- Hitachi, Ltd.
- Toshikatsu Kiriyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE