Manufacturing and sales of marine engine room accessories, instruments, liquid level gauges, air pipe heads, marine electrical control boxes, piping accessories and valves, metal cabinets, marine outfitting parts, air conditioning ducts, and rubber products; manufacturing and sales of mechanical equipment, hardware products, and electronic products; pipeline and equipment installation; ship repair; labor subcontracting. Licensed items: Manufacturing of railway transport infrastructure equipment. General items: Spray coating; manufacturing of thermal and sound insulation materials; sales of thermal and sound insulation materials; ship modification; metal surface treatment and heat treatment; general equipment repair; manufacturing of marine supporting equipment; manufacturing of diving and salvage equipment; sales of diving and salvage equipment; sales of fire-fighting equipment; sales of industrial automatic control system devices; manufacturing of industrial automatic control system devices; manufacturing of general equipment (excluding special equipment manufacturing); manufacturing of metal processing machinery; sales of mechanical equipment; sales of special equipment; manufacturing of metal structures; manufacturing of specialized equipment (excluding licensed specialized equipment manufacturing); repair of specialized equipment; marine engineering design and module design and manufacturing services; manufacturing of marine engineering equipment; manufacturing of marine engineering platform equipment; sales of marine engineering equipment; development of key marine engineering supporting systems; research and development of marine engineering equipment; ship design; ship repair; ship towing services; manufacturing of ship automation, detection, and monitoring systems; labor services (excluding labor dispatch); manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; marine meteorological services; hydrological services; software development; information system integration services; information technology consulting services; non-ferrous metal rolling processing; manufacturing of rubber products; steel rolling processing; manufacturing of glass fiber reinforced plastic products; sales of glass fiber reinforced plastic products; manufacturing of glass fiber and products; office services; socio-economic consulting services; bidding agency services; sales of railway transport infrastructure equipment; manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacturing of railway special measurement or inspection instruments; sales of railway special measurement or inspection instruments; manufacturing of electrical signal equipment devices; sales of electrical signal equipment devices; manufacturing of lighting fixtures; sales of lighting fixtures; manufacturing of intelligent basic manufacturing equipment; sales of intelligent basic manufacturing equipment; manufacturing of urban rail transit equipment; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; research and development of kitchen, bathroom, and daily-use sundries; retail of kitchen, bathroom, and daily-use sundries; research and development of sanitary ware; manufacturing of sanitary ware; sales of sanitary ware; manufacturing of furniture; sales of furniture; furniture installation and repair services; general mechanical equipment installation services; manufacturing of gas, liquid separation and purification equipment; sales of gas, liquid separation and purification equipment.