Design, development, production, sales, installation, maintenance, rental and related supporting services of mining rubber-tyred vehicles, mining equipment, special vehicles, electric vehicles, explosion-proof diesel engines, explosion-proof electrical equipment, agricultural and forestry machinery, petrochemical machinery, electromechanical equipment and accessories; remanufacturing of mechanical equipment; distribution of steel, coal (non-site operation, excluding coal storage yard), wires and cables, hardware and electrical appliances, electronic products, communication equipment; provision of labor services; import and export of goods and technologies.