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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.
radio and communication equipment and avionics equipment-namely, electronic aircraft communication, navigation and control systems, comprising audio controllers, drop cord assemblies, loud hailers, sirens, airframe analyzers, cb/mobile interfaces, mixer/isolation amps, ground buses, tie connectors and data collection units having vocal repeating capability