4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of trunk or long line

Gabriele Held-Elbert

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Method and apparatus for determining the value of analog voltage

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

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Method for determining telephone dial pulse parameters independe

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Profile ID: LFUS-PAI-P-1355578

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