Mechanical equipment research and development; mechanical and electrical equipment sales; mechanical parts and component processing; mechanical equipment sales; construction engineering machinery sales; hydraulic power machinery and component sales; mining machinery sales; construction metal accessory manufacturing; construction metal accessory sales; construction steel product sales; metal material sales; metal structure sales; non-ferrous metal alloy sales; metallurgical special equipment sales; steel and iron smelting; ferrous metal casting; metal ore sales; synthetic material sales; magnetic material sales; forgings and powder metallurgy product sales; hardware product retail; sealing part sales; rubber product sales; pump and vacuum equipment sales; environmental protection special equipment sales; high-performance sealing material sales; sealing filler sales; plastic product sales; general cargo warehousing services (excluding hazardous chemicals and other items requiring permits); road cargo transport for vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); mechanical equipment leasing; coal and product sales; agricultural machinery leasing; agricultural machinery sales; common non-ferrous metal smelting; soil and site remediation equipment sales; gold and silver product sales; non-ferrous metal alloy manufacturing; goods import and export; construction material sales; wire and cable operations; metal material manufacturing; renewable resource recycling (excluding production scrap metal); renewable resource sales; renewable resource processing; production scrap metal recycling; metal waste and scrap processing; precious metal smelting. Licensed items: construction labor subcontracting.