Manufacturing of railway locomotive and rolling stock parts; processing of mechanical parts and components; manufacturing of casting machinery; manufacturing of molds; industrial design services; research and development of mechanical equipment; engineering and technological research and experimental development; manufacturing of CNC machine tools; sales of railway locomotive and rolling stock parts; sales of mechanical parts and components; sales of casting machinery; sales of molds; sales of CNC machine tools; sales of chemical products (excluding licensed chemical products); manufacturing of general equipment (excluding specialized equipment manufacturing); manufacturing of specialized equipment (excluding licensed specialized equipment manufacturing); steel rolling and pressing processing; wood processing; manufacturing of wooden containers; leasing of residential housing; leasing of non-residential real estate; recycling of renewable resources (excluding production scrap metal); recycling of production scrap metal; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; manufacturing of hardware products; retail of hardware products; human resources services (excluding occupational intermediary and labor dispatch services); manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacturing of electrical accessories; sales of electrical accessories; manufacturing of forgings and powder metallurgy products; general cargo warehousing services (excluding items requiring licensing such as hazardous chemicals); domestic cargo transportation agency; road cargo transportation for general freight vehicles with a total mass of 4.5 tons and below (excluding online freight and dangerous goods).