Technical research and development, technical consultation, and technical services for railway transportation equipment production; manufacturing and sales of mechanical seals, ship mechanical accessories, lined PTFE pipe fittings, environmental protection equipment, metal hoses, compensators, insulation materials (aramid fiber cloth), railway transportation mechanical accessories, and packing; sealing material sales; ordinary road cargo transportation. ★★★ Licensed items: railway transportation infrastructure equipment manufacturing; special equipment manufacturing; special equipment inspection and testing. General items: seal manufacturing; seal sales; plastic product manufacturing; plastic product sales; metal structure manufacturing; metal structure sales; environmental protection special equipment manufacturing; environmental protection special equipment sales; synthetic fiber manufacturing; synthetic fiber sales; non-ferrous metal alloy manufacturing; non-ferrous metal alloy sales; rubber product manufacturing; rubber product sales; marine supporting equipment manufacturing; railway transportation equipment sales; counting instruments for transportation equipment and production manufacturing; general parts manufacturing; new building material manufacturing (excluding hazardous chemicals); graphite and carbon product manufacturing; insulation material sales; technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion; new material technology research and development; road cargo transportation of general goods with total mass of 4.5 tons and below (excluding online freight and dangerous goods); goods import and export; technology import and export; import and export agency; mechanical parts and components sales; special equipment sales.