Manufacture of gas and liquid separation and purification equipment; manufacture of material handling equipment; sales of special equipment; leasing of special equipment; sales of pipeline transport equipment; retail of hardware products; wholesale of hardware products; installation services for general mechanical equipment; engineering technical services (excluding planning management, survey, design, and supervision); sales of food additives; road cargo transportation of ordinary freight vehicles with a total mass of 4.5 tons and below (excluding online freight and dangerous goods). Licensed items: filling of mobile pressure vessels/gas cylinders; operation of hazardous chemicals.