Electric and electronic measuring, signalling, checking (supervision) apparatus and instruments; apparatus for recording, transmission and reproduction of sound or images; magnetic data carriers; communication and processing equipment and systems, modems, line drivers, time division multiplexers, statistical multiplexers, distributed communications processors, voice digitisers, network processor software, network control and management systems, network switching systems, digital encryption and security systems, information processing work station hardware and software, local area networks; computer programmes including computer programmes for information retrieval systems; fire detection and protection devices, fire and security monitoring and warning alarms; systems and devices, parts, fittings and accessories for the foregoing

Communication services for surveillance and security