Mold production, processing and sales; mold welding repair; mold maintenance; mechanical processing; wholesale and retail: welding materials and equipment, steel, mechanical equipment and accessories, electronic products and accessories, metal products, metal materials, automobile and motorcycle accessories, lubricants, standard parts, fasteners; import and export of goods and technology (except for the import and export of goods and technology prohibited by the state or involving administrative approval); sales of automation equipment; cleaning services and other items that are not prohibited and do not require a business license according to laws, regulations, decisions of the State Council, etc.