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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 and controlling electricity; transformers, power supply units; corresponding equipments and parts of the aforementioned goods and corresponding peripheral devices; electrical filters; 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. Installation, assembly, maintenance, measurement, surveillance, adjustment and repair of electrical apparatus and instruments, machines and installations, electrotechnical and electrical apparatus and equipments, apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity, transformers, power supply units and electrical filters.