Ching-Hsiung Cheng

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Tinan, TW

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Patents Grantslast 30 patents

Information Patent Grant
Push-button padlock with secondary key
- Patent number 4,751,830
- Issue date Jun 21, 1988
- Lock-R-Lock, Inc.
- Ching-Hsiung Cheng
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES