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

Thomas C. Liu

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Communication system having voice and data capability

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Ringing signal reformatting circuit

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

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Profile ID: LFUS-PAI-P-238288

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