Construction engineering machinery manufacturing; non-ferrous metal casting; casting machinery manufacturing; railway rolling stock parts sales; casting molding material sales; rail transit special equipment, key systems, and component sales; hydraulic power machinery and components manufacturing; hydraulic power machinery and components sales; metal forming machine tool manufacturing; construction engineering machinery sales; hardware product manufacturing; metal tool manufacturing; hardware product research and development; ferrous metal casting; valve and cock sales; hardware product wholesale; mold manufacturing; casting machinery sales; metal cutting and welding equipment manufacturing.