4. Telephonic communications
  5. Centralized switching system
  6. Switching controlled in response to called station...

Makoto Oohashi

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DTMF signal transmission method and communication apparatus

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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DTMF signal transmission method and communication apparatus

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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System for transmitting DTMF signal and communication...

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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