Manufacture of metal structures; sales of metal structures; manufacture of wooden containers; sales of wooden containers; sales of signs for traffic and public management; steel rolling processing; sales of lightweight building materials; sales of timber; sales of building materials; sales of metal products; research and development of metal products; sales of metal chains and other metal products; manufacture of metal chains and other metal products; sales of molds; sales of machinery and equipment; retail of hardware products; sales of hand carts and animal-drawn vehicles; sales of plastic products; sales of office supplies; labor services (excluding labor dispatch); road freight transport for ordinary cargo vehicles with a total mass of 4.5 tons and below (excluding network freight and dangerous goods); import and export of goods.