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Yuyao Tang Gong Stationery Co., Ltd.

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Patents Grantslast 30 patents

  • Information Patent Grant

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    • Patent number 9,566,640
    • Issue date Feb 14, 2017
    • Yuyao Tang Gong Stationery Co., Ltd.
    • Jianming Yuan
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...