4. Telephonic communications
  5. Supervisory or control line signaling
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Tune master internet protocol device

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

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Two way telephone communication system

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

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Two-way voice communication methods and apparatus

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

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Two-wire telecommunications line detection arrangements

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

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Two-wire telecommunications line detection arrangements

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

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