4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver
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Recognition of a single frequency tone

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

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Robust signaling tone frequency measurement

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

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Rotary dial pulse receiver

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

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