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Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
digital audio paging and control systems comprised of announcement controllers for public address systems, message communication servers, communication stations, peripheral interface devices, computer software and firmware for controlling and operating digital audio paging and control systems, microphones, audio amplifiers, audio speakers, and equipment racks sold as a unit of digital audio paging and control systems