Scientific, photographic, cinematographic, optical, measuring, signaling and checking apparatuses and checking instruments; apparatuses and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, data and light signals; apparatuses for recording, transmission or reproduction of data, sound or images; audio signal distributor; magnetic data media; electromechanical and electronic components and apparatuses; microphones; patch panels; dimmer switches; control panels; amplifying tubes or amplifying lamps; digital amplifiers; electric amplifiers; electroacoustic amplifiers; electronic amplifiers; optical amplifiers; image intensifies; amplifiers for vehicles; control units for amplifiers for use in vehicles; electrical amplifiers for use with musical instruments; amplifiers for bass guitars; power transformers for amplifiers; radar receivers with amplifiers; electrical amplifiers for sound signals; loudspeakers with integrated amplifiers, sound mixers with integrated amplifiers; audio dynamic characteristic modifiers; electric and electronic contact elements and couplings; plug-in connectors; plugs for data cables and electric connection lines; plug-in connectors and plugs for optical cables; optical waveguide connectors; optical waveguides; loudspeaker plugs; electrical power distribution blocks; hybrid and modular plug systems for electrotechnical, electronic, optoelectronic and optical apparatuses and components, modular plugs for power, data, light signals, in particular hybrid plugs for simultaneous connection of power, data, optical waveguides, patch panels, control panels, optical waveguides, fiber optic cables, optical fibers, controls, computers, control components, for or with the aforementioned goods, in particular hybrid plugs; software for controlling the hybrid plugs, patch panels, control panels for hybrid plugs; power distributer with and without measuring units; electronic power supplies; power distribution and power control machines, apparatuses and parts; power supply cords; loose and ready-made cables; cable reels (cable drums); amplifier cables; fiberoptic cables; optical fibers; transmitters; receivers and transceivers for data, sound or images; apparatuses for wireless data transmission; computer software relating to transmitting and receiving data, sound and images; computer software for controlling amplifiers; software for industrial processes, building information, building surveillance, building function, application software for mobile phones; apparatuses, electrical or electronic measuring devices and apparatuses, instruments, electrical plugs, electrical or electronic monitoring apparatuses and computers, electric couplings, earthing clamps, earthing spikes, electrical cables, electrical cable harnesses, electrical distributors, all aforementioned goods for mobile or static earthing systems and apparatuses or for potential equalization, for mobile or static systems and apparatuses, stages, event facilities, industry or buildings.