Devices for recording, transmitting, and reproducing sound and image, namely, audio and video cassette recorders, MP-3 players, CD-player, and mini-disc-player, radios, cameras, namely photographic cameras, displays, earphones; computers and data processing installations, namely computer monitors, printers, keyboards, CD-slots, DVDslots, computer-interfaces, game consoles, namely hand held joy stick units for playing computer games, card stations for magnetic-coated cards and memory cards; signal and control devices, namely, data radio transmitters and receivers; carriers of recorded sounds or images, namely, magnetic and optical data discs as well as magnetic-coated cards and memory cards; electrical weighting, measuring, signal and control devices and instruments, namely, fiber optics, lasers for measuring purposes, microphones, camera controllers, devices for measuring current voltage, resistance, capacitance, light intensity, sound intensity, temperatures, positions, distances, said devices and instruments capable of being controlled by a computer, namely personal computers, hand-held computers, and portable computers; sensors for the determination of temperatures, positions, and distances; electronic components and devices, namely, interfaces, namely computer interfaces, amplifiers, integrated circuits, processors, namely micro-processors, data processors, displays, namely light emitting diode displays, speakers, computer network switches, electric switches, resistors, capacitors, light emitting diodes, power supplies, and data transmission cables, automated test benches, namely for measuring electrical and mechanical parameters