Research, development, and manufacture of weapons and equipment; Road freight transport (excluding dangerous goods); Manufacture of road motor vehicles. General items: Manufacture of general equipment (excluding special equipment); Manufacture of specialized equipment (excluding licensed specialized equipment); Manufacture of metal structures; Sales of metal structures; Repair of specialized equipment; Repair of general equipment; Shipbuilding; Ship design; Sales of machinery and equipment; Machinery and equipment leasing; Research and development of machinery and equipment; Sales of intelligent robots; Sales of fire-fighting equipment; Sales of water transport equipment; Sales of metal products; Installation services for general mechanical equipment; Sales of underwater systems and operational equipment; Sales of intelligent unmanned aerial vehicles; Manufacture of traffic safety and control special equipment; Processing of mechanical parts and components; Sales agency; Technology import and export; Import and export of goods; Human resources services (excluding intermediary services and labor dispatch); Business training (excluding education and vocational training requiring permits); Foreign engineering contracting