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Dai Yongcai

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  • Tianjin City, CN
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Patents Grantslast 30 patents

  • Information Patent Grant

    Three-in-one drum
    • Patent number 9,224,371
    • Issue date Dec 29, 2015
    • Tianjin Jinbao Musical Instruments Co., Ltd.
    • Dingjun Wu
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS

Patents Applicationslast 30 patents