4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Using portable test set

Gerald J. Parsons

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Apparatus and method for identifying and analyzing telephone cha

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Circuit testing of telephone grids or the like

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

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Circuit testing of telephone grids or the like

Patent

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Method and apparatus as for testing a telephone line interface c

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Patent

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Profile ID: LFUS-PAI-P-543490

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