9 Scientific, nautical, surveying, electric, electronic photographic, cinematographic, optical, weighing, measuring, signalling, control, checking (supervision), life-saving and teaching apparatus and instruments; heavy current engineering, namely, in the fields of conduction, transformation, storage, regulation and control; apparatus and instruments for light current engineering, namely, in the fields of telecommunications, high frequency and regulation, apparatus for recording, transmitting and reproducing sound or images, magnetic data carriers, data processing equipment, and computers