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Apparatus and instruments for electrical engineering and for communications engineering, namely for regulating and control; Distribution boards, distribution boxes, sensors for measuring the temperature, flow velocity and concentration of gaseous and liquid media, metering centres, namely central apparatus and installations consisting thereof, for measuring, controlling and regulating operational installations; Central control stations for measuring and regulating systems, namely central apparatus and installations consisting thereof, for measuring, controlling and regulating operational installations; Medium-voltage and low-voltage installations, namely apparatus and instruments for switching and distributing electricity in the medium-voltage and low-voltage sector; Transformer stations, namely apparatus and installations consisting thereof, for transforming electricity from high voltage to low voltage; Emergency power supply apparatus, emergency generating units and UPS systems, namely apparatus and installations consisting thereof, for supplying electricity in the event of national grid failures, apparatus and installations consisting thereof, for compensating for reactive current in electrical distribution networks, cables and conduits for electricity mains, installation distributors, electrical installation apparatus and installations consisting thereof, fire alarm and hazard warning apparatus and installations consisting thereof, electric and electronic data logging and transmission apparatus, freely programmable electric control apparatus; For electric apparatus; Electric and electronic process control apparatus and installations consisting thereof, lightning protection apparatus, solar accumulators, fuel cells, temperature chambers, climatic chambers, corrosion checking and emissions measuring chambers, disassembled into transportable units; Functional endurance testing and performance testing apparatus; Motor and engine testing apparatus, gear testing apparatus; Fuel cells; Data processing apparatus; Computer memories and computers; Peripherals adapted for use with computers; Checking (supervision) apparatus, electric; Modems, m-bus meters (data management apparatus); Remote meter reading systems (data processing equipment)