Scientific, photographic, cinematographic, optical, measuring, signaling and checking apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of data, sound or images; magnetic data media; electromechanical and electronic components and apparatus, microphones, electronic amplifiers, electric and electronic contact elements and couplings, plug-in connectors, plugs for data cables and electric connection lines, plug-in connectors for optical cables, speaker cables, electrical power distribution blocks, electronic power supplies, power distribution and power control machines and apparatus, power supply cords; apparatus for recording, transmission or reproduction of sound or images; transmitter receivers and transceivers for data, sound or images; apparatus for wireless data transmission; computer software relating to transmitting and receiving data, sound and images.;