Manufacturing of metal daily necessities; manufacturing of automobile parts and accessories; processing of mechanical parts and components; sales of mechanical parts and components; manufacturing of general parts; research and development of motorcycles and parts; research and development of automobile parts; sales of metal products; research and development of metal products; manufacturing of metal chains and other metal products; sales of agricultural machinery; manufacturing of agricultural machinery; manufacturing of plastic products; sales of plastic products; sales of special rail transit equipment, key systems and components; manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacturing of sporting goods and equipment; wholesale of sporting goods and equipment; sales of metal materials; import and export of goods.