Manufacturing of bearings, gears and transmission parts; manufacturing of metal cutting machine tools; manufacturing of general equipment (excluding manufacturing of special equipment); sales of bearings, gears and transmission parts; sales of bearings; sales of machine tool functional parts and accessories; manufacturing of machine tool functional parts and accessories; sales of metal forming machine tools; manufacturing of metal forming machine tools; sales of CNC machine tools; sales of metal tools; sales of metal cutting machine tools; mechanical parts parts and components processing; sales of mechanical parts and components; sales of power electronic components; sales of metal products; manufacturing of auto parts and accessories; research and development of auto parts; retail of auto parts; wholesale of auto parts; retail of motorcycles and spare parts; research and development of motorcycles and parts; sales of electronic products; research and development of household appliances; sales of household appliances; research and development of machinery and equipment; research and development of metal products.