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Apparatus for recording, transmission and reproduction of sound or images; electromechanical and electronic components and apparatus, namely, electric connectors; electronic connectors; electric switches, electric plugs; electric and electronic contact elements, namely, plug connections, electrical connectors for electrical connection lines, electrical connectors and cable connectors for optical fibers, loudspeaker electrical plugs, electric couplings, plug-in connectors and electrical plugs for data cables and electric connection lines; plug-in connectors for optical cables; electrical cables for loudspeakers; electrical power distribution blocks; power distribution and power control machines and apparatus, namely, power controllers for power management controls; electric cords for use with power supplies, namely, power cable