Seiji Ichikawa

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Aizuwakamatsu, JA

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Patents Grantslast 30 patents

Information Patent Grant
Device for maintaining the oscillation of a balance for a timepiece
- Patent number 4,011,714
- Issue date Mar 15, 1977
- Rhythm Watch Co. Ltd.
- Tsutomu Ishizuka
- G04 - HOROLOGY