Research and development of metal products; manufacture of molds; sales of molds; sales of metal products; manufacture of plastic products; sales of plastic products; sales of electronic products; manufacture of general parts; sales of machinery and equipment; research and development of machinery and equipment; manufacture of rubber products; manufacture of specialized equipment (excluding licensed specialized equipment); manufacture of railway rolling stock parts; manufacture of auto parts and accessories; professional design services; repair of metal products; manufacture of high-speed rail equipment and parts; technology import and export; cargo import and export; sales of rubber products.