Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; manufacturing of special equipment for environmental protection; manufacturing of dust removal technical equipment; manufacturing of special equipment (excluding manufacturing of licensed professional equipment); manufacturing of material handling equipment; manufacturing of metal materials; manufacturing of metal daily necessities; research and development of mechanical equipment; sales of material handling equipment; sales of special equipment for environmental protection Sales of machinery and equipment; sales of metal materials; sales of construction and decoration materials; wholesale of hardware products; retail of hardware products; wholesale of auto parts and accessories; retail of auto parts and accessories; retail of motorcycles and spare parts; wholesale of motorcycles and spare parts; sales of chemical products (excluding licensed chemical products); sales of special chemical products (excluding hazardous chemicals); import and export of goods; import and export of technology.