4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Kenji Takato

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Battery feed circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery feed circuit for subscriber line

Communications: electrical – Systems – With specific power supply
Patent

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Battery feed circuit for supplying feed current to telephone set

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Calling signal transmission apparatus

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Ground fault detector

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Profile ID: LFUS-PAI-P-157641

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