Fire-fighting equipment sales; metal products sales; security equipment sales; fire-fighting technology services; wind engine and fan sales; sale of special equipment; sale of metal tools; sale of pumps and vacuum equipment; sale of specialized equipment for environmental protection; sale of refrigeration and air-conditioning equipment; sale of fibreglass enhanced plastics; rental of construction machinery and equipment; sale of mechanical parts, spare parts; sale of mechanical equipment; sale of specialized chemical products (excluding hazardous chemicals)。