Acoustic meters; Adapters; Apparatus for recording and reproduction of sound, images or data; Apparatus for recording, transmitting and reproducing sound and images; Blank magnetic data carriers; Calculating machines, data processing equipment and computers; Computer peripherals; Electric accumulators; Electric batteries; Electric cables, wires, conductors and connection fittings therefor; Electric connectors; Electric control panels; Electric fuse boxes; Electric meters; Electric plugs; Elec...