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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.
intercom systems and digital matrix intercom systems, comprised of system power supplies, intercom matrices, master stations, user stations, headset stations, speaker stations, passive speakers, beltpack stations, electronic stations, microphone preamplifiers, card frame assemblies, power supply assemblies, communications amplifiers, distribution amplifiers, microphone to line level amplifiers, buffer amplifiers, interfaces, system to system adapters, dual digital hybrid interfaces, rack mount panels, call light indicators, assign panels, junction boxes, rack mount kits, panel mount microphones, splitters, input and output pins, channel wall plates, interface cards, network cards, matrix trunking, keypanels, and parts therefor