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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.
[ instruments used for measuring and testing purposes-namely, ] directional couplers [ , distortion analyzers, electronic counters, frequency meters, frequency and modulation monitors, frequency converters, oscillators, power meters, pulse generators, ratiometers, scalers, secondary frequency standards, signal generators, square wave generators, standing wave indicators, tachometer indicators, voltmeters, wave analyzers, wave function generators ]