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

Sihn Tran

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Systems and methods for interference-suppression with...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Directional
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Zero crossing detection circuit

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

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Profile ID: LFUS-PAI-P-2899705

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