4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of repeater
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Feed imbalance detector in repeated line

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of repeater
Patent

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Repeater apparatus having isolation circuit

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of repeater
Patent

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Telephone line repeater and method of testing same

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of repeater
Patent

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