Mechanical and electrical equipment manufacturing; special equipment manufacturing (excluding licensed professional equipment manufacturing); general equipment manufacturing (excluding special equipment manufacturing); instrument manufacturing; general parts manufacturing; hardware product manufacturing; metal material manufacturing; metal structure manufacturing; general valve and cock manufacturing (excluding special equipment manufacturing); mechanical equipment research and development; hardware product research and development; mechanical equipment leasing; hardware product wholesale; metal material sales; metal structure sales; valve and cock sales; valve and cock research and development; household appliance sales; instrument sales; internet sales (excluding goods requiring sales permits); electronic and mechanical equipment maintenance (excluding special equipment); technical services, technology development, technical consulting, technical exchange, technology transfer, technology promotion; goods import and export; technology import and export; professional design services; engineering management services; general mechanical equipment installation services; special equipment repair; general equipment repair; non-residential real estate leasing; storage equipment leasing services; road freight transport for general cargo vehicles with a total mass of 4.5 tons and below (excluding network freight and dangerous goods). Licensed items: Road freight transport (excluding dangerous goods); construction engineering construction.