Scientific, optical, weighing, measuring, signalling, checking (supervision) 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; compact discs, DVDs and other digital recording media; data processing equipment, computers; computer software; control systems; installation systems for plug-in connectors; modular wiring systems.;