Charng-Ching Lan

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Ta Hsi Chien, Taoyuan Hsien, TW

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Patents Grantslast 30 patents

Information Patent Grant
Pen with selective multi-color cores
- Patent number 4,692,046
- Issue date Sep 8, 1987
- Charng-Ching Lan
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES