Article removal control system
Article security system
Article surveillance method and system
Article surveillance system
Article surveillance tag activation and deactivation system
Article surveillance tag having a metal clip
Article theft detection
Aspirated detector with flow sensor
Assault deterrent
Astragal for closure members
Asymmetrical antennas for use in electronic security systems
Atmospheric hazard detector network
Atmospheric safety monitoring device
Audible alarm device and fire alarm system including the same
Audible alarm for portable telephone or message receiver
Audible alarm with laminated magnetic core
Audible and audible-visible alarms with interchangeable cover
Audible signal apparatus
Audible tag for magnetic electronic article surveillance...
Audible warning of disembarked bus passengers