4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Using portable test set
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Line tester for coin-operated telephones

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

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Listening device for tracing line continuity and detecting telep

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

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