TREA

Chih-Yin Chung

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  • Information Patent Grant

    Speed changing device for a bicycle
    • Patent number 5,575,731
    • Issue date Nov 19, 1996
    • Chih-Yin Chung
    • Chih-Yin Chung
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS

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