Civil defence warning system - uses telephone system to transmit signals triggering alarm stations

A nationwide warning system for alerting the civilian population uses the public telephone system to provide connection and activation of sirens. The system is based upon a centralised control point connecting through sub-stations and branch points. The alarm units that tare distributed nationally a...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	PIEHL,RALF, KRAUSER,KLAUS, WITTE,HORST, MOSCH,RUDOLF
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ALARM SYSTEMS ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS
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