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  • CPC
  • H04Q2213/211
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Patents Grantslast 30 patents

  • Information Patent Grant

    ISDN user-network interface system

    • Patent number 5,309,440
    • Issue date May 3, 1994
    • Kokusai Denshin Denwa Kabushiki Kaisha
    • Hajime Nakamura
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE