4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of centralized switching system
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Electronic exchange apparatus

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

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Electronic interface for exchange of trouble administration info

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

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Electronic switching system capable of analyzing charge data aut

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

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Electronic switching system for testing the status of subscriber

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

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Emulator for a telephone system

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

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Enhanced recording verification system

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

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Entrance telephone system utilizing the public subscriber teleph

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

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Error protected central control unit of a switching system and m

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

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