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

Brian D. Greenwald

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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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Emergency alert system

Communications: electrical – Condition responsive indicating system – With particular coupling link
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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-543491

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