4. Telephonic communications
  5. Call or terminal access alarm or control
  6. At switching center

Katsuyuki Hanai

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Electronic exchange apparatus

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
Patent

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System for controlling a call termination on the basis of caller

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation
Patent

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Telephone system

Telephonic communications – Call or terminal access alarm or control – At switching center
Patent

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Profile ID: LFUS-PAI-P-144934

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