Ryuzo Tanaka

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Tanashi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Mounting structure of plastic glass in watch case
- Patent number 4,326,281
- Issue date Apr 20, 1982
- Citizen Watch Co., Ltd.
- Ryuzo Tanaka
- G04 - HOROLOGY
Information Patent Grant
Dial and movement fixing structure
- Patent number 4,207,735
- Issue date Jun 17, 1980
- Citizen Watch Co., Ltd.
- Hisao Ishigaki
- G04 - HOROLOGY
Information Patent Grant
Wristwatch case
- Patent number 4,186,552
- Issue date Feb 5, 1980
- Citizen Watch Co., Ltd.
- Hisao Ishigaki
- G04 - HOROLOGY
Information Patent Grant
Dial attaching device for watch
- Patent number 4,150,538
- Issue date Apr 24, 1979
- Citizen Watch Company Limited
- Yasuaki Nakayama
- G04 - HOROLOGY