Shot blasting machines, sand treatment equipment, sandblasting rooms and painting production lines, environmental protection dust filter bags, filter drums, environmental protection dust removal equipment, wear-resistant castings, heat-resistant steel castings (material trays, liners) manufacturing; hardware, motors, electronic products, rubber parts, metal materials, building materials, daily necessities (excluding electric tricycles) sales; self-operated and agent import and export of various commodities (excluding those restricted or prohibited by the state). Foundry machinery manufacturing; metal surface treatment and heat treatment processing; foreign contracted projects. Licensed items: special equipment installation, modification, and repair; railway locomotive and rolling stock maintenance. General items: motor vehicle repair and maintenance.