Jui-Hua Chang

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Taipei City, TW

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Patents Grantslast 30 patents

Information Patent Grant
Door lock unlockable electro-magnetically and with a key
- Patent number 5,974,912
- Issue date Nov 2, 1999
- Tung-Chi Cheng
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES