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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.
audio signal transfer system for use in audio systems comprised of a master control center which receives source signals for transmission to other components in the system, a control amplifier, a control panel for selection of volume level, sources to be heard and functions of signal sources (such as the functions of compact disc players, tape recorders/players and video recorders/players), programmable remote control, signal combiners, control cables, connector wall plates and remote receivers