Tokuhisa Hijikata

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Tokyo, JA

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Patents Grantslast 30 patents

Information Patent Grant
Key telephone system
- Patent number 4,024,353
- Issue date May 17, 1977
- Iwatsu Electric Co., Ltd.
- Tokuhisa Hijikata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Visual indicating control circuit in key telephone system
- Patent number 3,971,898
- Issue date Jul 27, 1976
- Iwatsu Electric Co., Ltd.
- Tokuhisa Hijikata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE