Smart instruments and meters sales; instruments and meters sales; daily-use ceramic products sales; building materials sales; refractory materials sales; graphite and carbon products sales; power electronic components sales; motor manufacturing; mechanical equipment sales; hardware products retail; hardware products wholesale; rubber products sales; metal materials sales; office equipment sales; refrigeration and air conditioning equipment sales; electronic products sales; chemical products sales (excluding licensed hazardous chemicals); specialized chemical products sales (excluding hazardous chemicals); office equipment consumables sales; goods import and export; technology import and export; furnace, melting furnace and electric furnace sales; furnace, melting furnace and electric furnace manufacturing; metal ore sales; office supplies sales; environmental protection special equipment sales; wires and cables operation; fire-fighting equipment sales; casting machinery sales; daily-use chemical products sales; electrical equipment repair; specialized equipment repair; general equipment repair; communication equipment repair; instruments and meters repair; electronic and mechanical equipment maintenance (excluding special equipment); general mechanical equipment installation services; non-ferrous metal alloy sales; metal chains and other metal products sales; new metal functional materials sales. Licensed items: construction engineering construction; residential interior decoration; construction engineering design; toxic chemicals import and export; railway rolling stock maintenance.