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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 foot-controlled guitar amplifier, bass amplifier, keyboard amplifier, and musical instrument amplifier selector; guitar, bass, keyboard, and musical instrument audio signal switcher; guitar, bass, keyboard, and musical instrument audio signal mute selector; guitar amplifier, bass amplifier, keyboard amplifier, and musical instrument audio signal combiner; audio signal input buffers for use with guitar, bass, keyboards and musical instruments; guitar amplifiers, bass amplifiers, keyboards amplifiers, and musical instrument amplifiers, and instructional manuals, sold as a unit