4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Fallback function telecommunications device

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

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Far-end disconnect detector for telephony systems

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

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