TREA

Zenzou Tozuka

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Keyboard switch and method of manufacturing the same
    • Patent number 5,256,843
    • Issue date Oct 26, 1993
    • Oki Electric Industry Co., Ltd.
    • Toshimi Chiba
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Keyboard
    • Patent number 4,851,618
    • Issue date Jul 25, 1989
    • Oki Electric Industry Co., Ltd.
    • Fumihiro Amino
    • H01 - BASIC ELECTRIC ELEMENTS