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

Qiang Fan

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Method for automatically switching telephone system to an...

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

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Method of automatically changing a calling mode of telephone...

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

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Profile ID: LFUS-PAI-P-2892633

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