4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation

David J. Guercio

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Communications device with improved ring signal detection

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

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Telephone calling party announcement system and method

Telephonic communications – Audio message storage – retrieval – or synthesis – Dynamic audio signal recording or reproduction
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1252644

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