TREA

Jiang Y. Geng

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  • Shanghai, CN
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of roll forming a skip threading tap
    • Patent number 4,794,821
    • Issue date Jan 3, 1989
    • Shanghai Bicycle Factory
    • Jiang Y. Geng
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...