Manufacturing of rubber products; ferrous metal casting; manufacturing of metal structures; manufacturing of metal materials; sales of metal structures; sales of metal products; sales of rubber products; manufacturing of rubber processing specialized equipment; sales of rubber processing specialized equipment; manufacturing of environmental protection specialized equipment; sales of environmental protection specialized equipment; manufacturing of metal forming machine tools; sales of metal forming machine tools; metal cutting processing services; steel rolling and processing; sales of chemical products (excluding licensed hazardous chemicals); R&D of new material technologies; road freight transport for ordinary trucks with a total mass of 4.5 tons or less (excluding network freight and dangerous goods); engineering management services; engineering technical services (excluding planning management, survey, design, and supervision). Licensed items: Inspection and testing services; specialized construction operations.