G - Physics – 08 – B
Patent
G - Physics
08
B
340/102, 340/125
G08B 13/22 (2006.01) G08B 13/00 (2006.01) G08B 19/00 (2006.01) G08B 25/14 (2006.01)
Patent
CA 1075792
A B S T R A C T A multi-mode intrusion alarm system having three different operating modes for providing different indications of present and past occurrence of alarm signals from a plurality of sensors. The different modes allow determination of which sensor produced the alarm signal, investigation of the protected area after oc- currence of an alarm signal without disturbing such determination and resetting of the system. The system can include circuitry for automatic mode selection and for providing a warning when the system has not been properly reset.
276257
Galvin Aaron A.
Shapiro L. Dennis
Skov Valdemar
American District Telegraph Company
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