Ching-Yuan Cheng

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Taichung, TW

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Patents Grantslast 30 patents

Information Patent Grant
Case lock
- Patent number 6,547,293
- Issue date Apr 15, 2003
- Ching-Yuan Cheng
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Combination changing mechanism and combination lock used said mecha...
- Patent number 4,669,286
- Issue date Jun 2, 1987
- Ching-Yuan Cheng
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES