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; anodes; anodes for cathodic protection; anodes for use in chlorine-alkali cells with mercury cathodes; anodes having hydrodynamic means for electrolyte recirculation; anodes made of metal alloys for use in protecting against corrosion, anodes for use in chlorine-alkali cells with mercury cathodes; cathodes; rotary anti-cathodes for X-ray tubes (other than for medical use)