Sales of environmental protection equipment; Manufacturing of glass fiber reinforced plastic products; Sales of glass fiber reinforced plastic products; Manufacturing of coal-fired flue gas desulfurization and denitrification equipment; Sales of coal-fired flue gas desulfurization and denitrification equipment; Manufacturing of plastic products; Sales of plastic products; Manufacturing of rubber products; Sales of rubber products; Manufacturing of pumps and vacuum equipment; Sales of pumps and vacuum equipment; Manufacturing of refrigeration and air conditioning equipment; Sales of refrigeration and air conditioning equipment; Manufacturing of metal structures; Sales of metal structures; Sales of metal products; Machining and sales of mechanical parts and components; Manufacturing and sales of general equipment; Repair of general equipment; Sales of machinery and equipment; Sales of pipeline transportation equipment; Manufacturing and sales of fans and blowers; General machinery installation services.