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

Ian R Drury

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Communications system

Telephonic communications – Emergency or alarm communications – With automatic dialing or transmission of recorded audio...
Reexamination Certificate

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Fault location in a telecommunications network

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

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Profile ID: LFUS-PAI-P-2825930

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