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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.
telephone data switching systems comprising a subscriber switch and controller, a group switch and controller, a trunk line supervisor and signaller, a common channel signaller, a mobile telephone connection controller, an operator connection controller, a regional processor, a central processor, terminals, printers, displays, maintenance units, processor test units and computer programs therefor