Manufacture of rubber products; sale of rubber products; manufacture of high-performance fibers and composite materials; sale of high-performance fibers and composite materials; manufacture of metal wire ropes and their products; sale of metal wire ropes and their products; manufacture of industrial textile products; sale of industrial textile products; manufacture of specialized rubber processing equipment; sale of specialized rubber processing equipment; road freight transport of general cargo vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); manufacture of mining machinery; sale of mining machinery; manufacture of special ceramic products; sale of special ceramic products; repair of specialized equipment; import and export of goods; manufacture of mechanical and electrical equipment; sale of mechanical and electrical equipment.