37 Repair, installation, maintenance, servicing and cleaning of electrostatic generators and thermoelectric generators, electric power generators for indoor use, machine tools for removing waste material, electricity generators, current generators, electricity generators for use in power plants, thermoelectric converters, electric converters, electric power converters, electric transformers, apparatus and instruments for conveying, distributing, transforming, storing, regulating, or controlling electric current, electric accumulators, voltage regulators for electric power, electrical controlling devices, resistors for distributing or controlling electric current, electrical controllers, electric control devices for heating and energy management, voltage monitor modules, thermoelectric converters, peltier cooling and heating apparatus, thermoelectric heat pumps, pulse generators for testing electric current, electrical power supplies, uninterruptible electrical power supplies, battery chargers, wireless chargers, air conditioners, ventilating fans for industrial use, energy recovery ventilators, air handlers, heating units for industrial purposes, Peltier cooling and heating apparatus, heat generators, heat accumulators, thermoelectric heat pumps, electrical and electronic apparatus and equipment all for use in generating energy obtained from alternative energy sources