digital storage systems for digital video recorders, comprised of, digital video recorders, time-lapse digital video recorders for use with closed circuit television or surveillance systems, video cameras, transmitters, receivers, multiplexers, quads, video camera controllers, matrix switchers, and computers and computer software used for surveillance
Electrical and Scientific Apparatuscentral station electric protection services, namely, fire alarm monitoring services, watchman supervisory services, sprinkler and waterflow supervisory service, intruder and burglar alarm monitoring service
Computer and Scientific