4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of trunk or long line
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Impedance measuring apparatus for R.F. baseband signals over two

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent

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In-line telephony data protector with line condition announce

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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Integrated ring sensor with fault detection

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent

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Intelligent line testing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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