Processing, manufacturing, and sales of power equipment, instruments and meters, safety tools, construction and maintenance tools, live working tools, sliding wire electrical equipment, cable trays, electric heaters, and technical consulting, technical services, and live cleaning services; sales of power engineering vehicles, automobiles and parts, unmanned helicopters, remote-controlled aircraft, and imported power equipment. General items: Manufacturing of specialized equipment for petroleum drilling; manufacturing of mining machinery; manufacturing of ecological environment monitoring and testing instruments and meters; manufacturing of coal-fired flue gas desulfurization and denitrification equipment; manufacturing of traffic safety and control specialized equipment; manufacturing of security equipment; sales of railway special measurement or inspection instruments; sales of railway locomotive and rolling stock parts; manufacturing of lighting fixtures; manufacturing of railway special measurement or inspection instruments; manufacturing of high-speed rail equipment and accessories; sales of intelligent power transmission and distribution and control equipment; sales of wind farm related equipment; manufacturing of photovoltaic equipment and components; manufacturing of cultural and office equipment; engineering technical services (excluding planning management, survey, design, and supervision); earthwork construction; repair of specialized equipment; contracting of foreign projects; manufacturing of environmental monitoring specialized instruments and meters; manufacturing of metal wire ropes and products; repair of electrical equipment; sales of power facility accessories.