4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Line status indication or call alerting

Eric A. Jones

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Message waiting indicator in a computer integrated telephony...

Telephonic communications – Audio message storage – retrieval – or synthesis – Indication or notification of message
Reexamination Certificate

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Telephone extension switch hook state detection system

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Profile ID: LFUS-PAI-P-951668

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