Shingo Ichikawa

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Sayama, JA

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Patents Grantslast 30 patents

Information Patent Grant
Electronic timepiece with digital display means
- Patent number 4,026,103
- Issue date May 31, 1977
- Citizen Watch Co., Ltd.
- Shingo Ichikawa
- G02 - OPTICS
Information Patent Grant
Digital time error measuring arrangement
- Patent number 3,946,592
- Issue date Mar 30, 1976
- Citizen Watch Company Limited
- Shingo Ichikawa
- G04 - HOROLOGY