Research, development, design, manufacturing, and sales of power conduits, communication conduits, water supply and drainage conduits, and plastic products; design, production, processing, and sales of hydraulic electromechanical complete sets of equipment, castings, cable trays, high-mast lights, street lights, light poles, light boxes, guardrails, electromechanical products and parts, welded parts, and standard parts; vehicle rental. General items: manufacturing of glass fiber reinforced plastic products; sales of glass fiber reinforced plastic products.