Research and development of new material technology; research and development of mechanical equipment; manufacturing of seals; manufacturing of special equipment for rubber processing; manufacturing of rubber products; manufacturing of plastic products; manufacturing of general equipment (excluding manufacturing of special equipment); manufacturing of mechanical and electrical equipment; manufacturing of general parts; sales of mechanical equipment; sales of seals; sales of rubber products; sales of special equipment for rubber processing; sales of plastic products; mechanical and electrical Sales of gas equipment; sales of instruments; sales of electronic products; sales of office equipment; sales of household appliances; sales of knitted textiles; sales of daily necessities; sales of chemical products (excluding licensed chemical products); wholesale of hardware products; wholesale of auto parts; wholesale of motorcycles and spare parts; wholesale of stationery; wholesale of edible agricultural products; wholesale of bicycles and spare parts; import and export of goods.