4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. With blocking of normal usage
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Line current test device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Loop detection signal issuing circuit in subscriber circuit havi

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Loop status verification system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Loop status verification system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Loop-back test system using a suppressed ringing connection

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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