Manufacturing of generators and generator sets; manufacturing of general equipment (excluding manufacturing of special equipment); manufacturing of specialized machinery for agriculture, forestry, animal husbandry, and fishery; manufacturing of pumps and vacuum equipment; manufacturing of agricultural machinery; manufacturing of machinery parts for agriculture, forestry, animal husbandry, and fishery; installation and maintenance of professional machinery for agriculture, forestry, animal husbandry, and fishery; sales of mechanical and electrical equipment; sales of pumps and vacuum equipment; sales of generators and generator sets; sales of agricultural machinery; parks Sales of art products; sales of professional machinery for agriculture, forestry, animal husbandry, sideline and fishery; sales of agricultural, forestry, animal husbandry and fishery machinery accessories; wholesale of automobile spare parts; retail of automobile spare parts; wholesale of motorcycles and spare parts; retail of motorcycles and spare parts; sales of metal materials; sales of batteries; sales of mechanical parts and components; sales of special textile equipment; sales of sewing machinery; sales of machinery and equipment; import and export of goods.