Manufacturing of special equipment for oil drilling; sales of special equipment for oil drilling; manufacturing of deep-sea oil drilling equipment; sales of deep-sea oil drilling equipment; manufacturing of underwater systems and operating equipment; sales of underwater systems and operating equipment; manufacturing of marine engineering equipment; sales of marine engineering equipment; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; emerging energy technology research and development; general equipment manufacturing (excluding special equipment manufacturing); special equipment manufacturing (excluding licensed special equipment manufacturing); manufacturing of auto parts and accessories; mechanical equipment leasing; mechanical equipment sales; mechanical equipment research and development; mechanical and electrical equipment manufacturing; mechanical and electrical equipment sales; special equipment repair; electrical equipment repair; electrical equipment sales; general component manufacturing; mechanical parts and component processing; metal structure manufacturing; metal structure sales; metal product repair; metal product sales; metal material sales; special equipment sales; environmental protection special equipment sales; electronic and mechanical equipment maintenance (excluding special equipment); mold manufacturing; metal surface treatment and heat treatment processing; spray coating processing; quenching processing; general cargo warehousing services (excluding hazardous chemicals and other items requiring permits); goods import and export; technology import and export; intelligent power distribution and control equipment sales; electronic components and electromechanical component equipment sales; chemical product sales (excluding licensed chemicals); hardware product wholesale; import and export agency. Licensed items: road motor vehicle manufacturing; special equipment manufacturing; construction engineering design; road cargo transport (excluding dangerous goods); inspection and testing services; accommodation services.