9 Scientific apparatus and instruments, namely, electrical control units for regulating rotor blades, wind turbine converters, motors, machine coupling and transmission components, hydraulic pumps, wind-powered electricity generators, power machines for generating wind energy and parts of the aforementioned goods in wind turbines and electricity generators; optical, measuring, checking and teaching apparatus and instruments, namely, wind turbine control systems comprised of vibration sensors, anemometers, electric watt-hour meters, computers and computer software for the control and monitoring of constant voltage, frequency, phase conditions, rotor speed, efficiency and thickness of brake pads, temperature, and direction and speed of wind; inverters; apparatus and instruments for conducting, distribution, switching, accumulating, regulating and controlling of electricity, namely, wind turbine controllers; power transforming apparatus, namely, wind turbine transformers