TREA

Eiji Hirooka

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  • Yamato-Koriyama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Roll with width adjusting function
    • Patent number 5,154,074
    • Issue date Oct 13, 1992
    • Sumitomo Metal Industries, Ltd.
    • Tetsuro Haraguchi
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Variable-crown roll
    • Patent number 4,860,416
    • Issue date Aug 29, 1989
    • Sumitomo Metal Industries
    • Takeshi Masui
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...