Scientific, nautical, surveying, electric, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus; fiber optic communication components, namely, optical multiplexers, optical demultiplexers, optical spectrum analyzers, reconfigurable add/drop multiplexers, electro optic solid state switches, semiconductor diode laser, multiplexed optical signal attenuators