Tzyh-Suenn Chia

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Hsinchu, TW

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Patents Grantslast 30 patents

Information Patent Grant
Numeral lock with changeable unlocking numbers
- Patent number 5,186,032
- Issue date Feb 16, 1993
- Tzyh-Suenn Chia
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES