Sen-Der Cheng

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Taichung, TW

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Patents Grantslast 30 patents

Information Patent Grant
Pieces assembable to form regular hexagons and other figures
- Patent number 4,773,649
- Issue date Sep 27, 1988
- Tien-Tsai Huang
- Sen-Der Cheng
- A63 - SPORTS GAMES AMUSEMENTS