Chuan-Yi Cheng

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Keelung, TW

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Patents Grantslast 30 patents

Information Patent Grant
Electrical screwdriver
- Patent number 5,044,234
- Issue date Sep 3, 1991
- Chuan-Yi Cheng
- B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
Information Patent Grant
Auxiliary soldering device for electric solder iron
- Patent number 5,019,688
- Issue date May 28, 1991
- Chuan-Yi Cheng
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR