4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver
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Low power signal detection

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Low-frequency alternating current signal detector, in particular

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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LPC-based DTMF receiver for secondary signalling

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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