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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.
electronic recording/reproducing apparatus embodying noise reduction circuits for use in connection with audio [ and video ] signals--namely, magnetic tape recorders,, cassette recorders, [ record players, ] radio [ transmitters and ] receivers, and motion picture sound track recording and reproducing apparatus; magnetic tapes [ , discs, ] * and * motion picture sound tracks [ , and video recordings ] of electrical signals which have been subjected to dynamic range compression prior to recording