Manufacturing of bearings; manufacturing of bearings, gears and transmission parts; sales of bearings; sales of bearings, gears and transmission parts; sales of high-speed precision heavy-duty bearings; high-speed rail equipment and accessories manufacturing; general equipment manufacturing (excluding special equipment manufacturing); sales of forgings and powder metallurgy products; sales of mechanical parts and parts; processing of mechanical parts and parts; technical services, technology development, technical consulting, technical exchanges, technology transfer, technology promotion; sales of metal materials; sales of new metal functional materials; sales of high-performance non-ferrous metals and alloy materials; sales of metal ores; sales of non-metallic minerals and products