9 Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking and supervision, life-saving and teaching apparatus and instruments, namely, antennas, headends, satellite dishes and associated electronics, combiners, splitters, couplers, mixers, electrical switches, coaxial cables, filters, amplifiers, preamplifiers, channel converters, power supplies, modulators, demodulators, plugs, and sockets; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; blank magnetic data carriers and recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus