Manufacture of bearings, gears, and transmission components; sales of bearings, gears, and transmission components; processing of mechanical parts and components; sales of mechanical parts and components; sales of metal materials; sales of chemical products (excluding licensed chemical products); sales of rubber products; sales of instruments and meters; sales of daily necessities; import and export of goods; import and export of technologies; road freight transport for ordinary vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods).