LARMSYSTEM OMFATTANDE EN CENTRAL OCH TILL DENNA ANSLUTNA ABONNENTER

An alarm system for a number of individual subscribers connected to a central installation in which each subscriber can signal the central installation when help is needed and the central installation can signal back to the subscriber indicating receipt of the call. The subscriber can make further c...

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Bibliographic Details
Main Author HILLBERG A V
Format Patent
LanguageSwedish
Published 07.03.1977
Subjects
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:An alarm system for a number of individual subscribers connected to a central installation in which each subscriber can signal the central installation when help is needed and the central installation can signal back to the subscriber indicating receipt of the call. The subscriber can make further calls and receive signals from the central installation in return.
Bibliography:Application Number: SE19740002133