TREA

Takao Tanaka

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Patents Grantslast 30 patents

  • Information Patent Grant

    Threaded fastener
    • Patent number 4,637,767
    • Issue date Jan 20, 1987
    • Topura Co., Ltd.
    • Kouichi Yaotani
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...