4. Telephonic communications
  5. Multi-line or key substation system with selective switching...

Frank F. Meijer

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Connection controller for setting-up a media path between a...

Telephonic communications – Audio message storage – retrieval – or synthesis – Interacting voice message systems
Reexamination Certificate

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Method and apparatus allowing remote key system units to...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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