Aluminum alloy product design, aluminum alloy material development and related product production and sales; mold and tooling design, production and sales; machining; design, manufacturing and sales of non-standard mechanical equipment; sales of railway locomotive and vehicle parts, steel, non-ferrous metals, furnace materials, and mechanical equipment; import and export of goods and technologies (excluding those restricted or prohibited by the state); installation, commissioning, repair, and maintenance of electromechanical equipment (excluding public safety equipment and devices); loading and unloading, property services, and housing leasing.