4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation

Toshiro Tojo

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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 telephone subscriber line

Patent

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Ground fault detector

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

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Hybrid circuit

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent

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Integrated ringing circuit and a ring trip circuit for the same

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Profile ID: LFUS-PAI-P-819260

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