Data communication device
Data request router for use with emergency public safety answeri
Data transmission apparatus for use with a security system havin
Determining a local emergency dial-string
Determining the geographical location from which an...
Device and method for article storage and release
Dial-out voice notification system
Digital control of a security system
Disaster alert by telephone system
Dispatcher-activated response identification light (DARIL) and m
Dispatcher-activated response identification light (DARIL) and m
Double annular ring speaker gasket