4. Telephonic communications
  5. Call or terminal access alarm or control

Richard Arthur Swan

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Telecommunications functions management system for managing outg

Telephonic communications – Call or terminal access alarm or control
Patent

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Telecommunications functions management system providing selecti

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

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Telecommunications functions management system providing selecti

Telephonic communications – Audio message storage – retrieval – or synthesis – Message management
Patent

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Telecommunications functions management system providing...

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

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Telecommunications functions management system providing...

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

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