4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Including fault responsive disconnection of tested component

Joseph F. M. Darveau

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Method of providing d.c. feed to a telephone line

Telephonic communications – Subscriber line or transmission line interface
Patent

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Protection and recovery of telephone line interface circuits

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Including fault responsive disconnection of tested component
Patent

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Profile ID: LFUS-PAI-P-496015

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