Processing, manufacturing, research and development, installation, and sales of cable troughs, cable brackets, sound barriers, electrical boxes, waterproof boards, protective covers, evacuation platforms, vehicle interior roof panels, side wall panels, window frames, bumpers, spoilers, battery pack boxes, battery pack covers, cooling towers, containers, septic tanks, purification tanks, pipelines, fans, energy-saving and environmental protection equipment, fiber-reinforced resin sheet molding compounds, fiber-reinforced resin sheet molding composite products, central air conditioning terminals, rubber, rubber-plastic, plastic, and metal products, anti-corrosion and thermal insulation, mechanical and electrical installation, and after-sales service for the above products; operation of export business of self-produced products and technologies and import business of machinery, equipment, spare parts, raw and auxiliary materials, and technologies required by the enterprise, except for commodities and technologies restricted or prohibited by the state.