4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Jimmy D. Slife

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Adaptive no balance DX signalling circuit

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

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Programmable universal signaling circuit for a telephone network

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
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Profile ID: LFUS-PAI-P-1202867

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