Research and development of metal products; research and development of hardware products; manufacturing of metal chains and other metal products; sales of metal chains and other metal products; sales of metal products; manufacturing of rubber products; sales of rubber products; manufacturing of tires; sales of tires; manufacturing of hardware products; wholesale of hardware products; retail of hardware products; manufacturing of hand carts and animal-drawn vehicles; sales of hand carts and animal-drawn vehicles; manufacturing of daily-use wooden products; sales of daily-use wooden products; manufacturing of plastic products; sales of plastic products; sales of molds; manufacturing of daily-use metal products; sales of non-ferrous metal alloys; sales of mechanical parts and components; sales of metal materials; sales of non-metallic minerals and products; manufacturing of metal wire ropes and their products; sales of metal wire ropes and their products; sales of specialized chemical products (excluding hazardous chemicals); sales of chemical products (excluding licensed chemical products); sales of engineering plastics and synthetic resins; manufacturing of wooden containers; sales of wooden containers; import and export of goods; import and export of technology.