Manufacture of metal products for safety and fire protection; manufacture of metal structures; sales of metal structures; construction of metal doors and windows; sales of metal products; repair of metal products; manufacture of containers; sales of containers; manufacture of doors and windows; sales of doors and windows; manufacture of security equipment; sales of security equipment; manufacture of hardware products; retail of hardware products; wholesale of hardware products; manufacture of mechanical and electrical equipment; sales of mechanical and electrical equipment; sales of intelligent power distribution and control equipment; manufacture of power facility equipment; sales of power facility equipment; manufacture of internet of things equipment; sales of internet of things equipment; integration of intelligent control systems; system integration services; system operation and maintenance services; manufacture of currency-specific equipment; sales of currency-specific equipment; design and construction services for security technology prevention systems; retail of computer software and hardware and auxiliary equipment; sales of daily-use glass products; sales of office supplies; sales of furniture; manufacture of furniture; leasing services (excluding licensed leasing services); import and export of goods; import and export of technology; installation services for general machinery and equipment; professional design services; road freight transport of ordinary goods with a total mass of 4.5 tons or less (excluding network freight and dangerous goods). Permitted items: design of building intelligent systems; construction engineering construction.