TREA

Toshihiko Umeda

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  • Chigasaki, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Telephone circuit
    • Patent number 6,671,375
    • Issue date Dec 30, 2003
    • Hitachi, Ltd.
    • Takeshi Fukuju
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE