Ship communication services; Ship building services; Ship repair; Sales of ship spare parts; Mechanical and electrical equipment installation services; Ship inspection; Installation services for radar, navigation, and measurement and control system engineering; Manufacturing of ship automation, detection, and monitoring systems; Manufacturing and installation of ship outfitting components; Mechanical technology transfer services; Mechanical technology consulting and communication services; Mechanical technology development services; Mechanical technology promotion services; Rental of mechanical equipment; Wholesale of metal products; Metal product repair; Sales of electrical and mechanical equipment; Technology import and export; Import and export of goods (excluding exclusively operated and controlled goods); Wholesale of labor protection equipment; Wholesale trade of goods (excluding licensed and approved goods); Metal ship manufacturing; Professional cleaning services for mechanical equipment; Special equipment repair; Wholesale of mechanical accessories; Manufacturing and processing of hardware accessories; Wholesale of hardware products; Ship modification and dismantling; Railway, road, tunnel and bridge engineering construction; Installation of lighting system; Installation services for building air conditioning equipment and ventilation equipment systems; Ship supply service