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Apparatus and instruments for signal production, signal capture and signal processing, including apparatus and instruments for making use of electrical engineering methods, for measuring, testing and analysing power supply systems and power supply components; data processing apparatus and connecting elements and apparatus attached thereto for measuring, testing and analysing power supply systems and power supply components; electronic measurement, testing and analysis equipment for measuring, testing and analysing power supply systems and power supply components; measuring, testing and analysis software and data bases for connection to the aforesaid measurement, testing and analysis software for measuring, testing and analysing power supply systems and power supply components; electric meters, electronic meters, meters for capturing electronic parameters, meters for use in development and research laboratories, meters for industrial applications, meters for university training, namely for measuring, testing and analysing power supply systems and power supply components; computer programs for measuring, testing and analysing power supply systems and power supply components; apparatus for the administration of power supply systems and power supply components