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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 2)
6: Manufactured goods classified chiefly by material
67: Iron and steel
678: Tubes, pipes and fittings, of iron or steel
678: Tubes, pipes and fittings, of iron or steel
6781: Tubes and pipes, of cast iron
6782: "seamless"tubes and pipes; blanks for tubes & pipes
6783: Other tubes and pipes, of iron or steel
6784: High-pressure hydro-electric conduits of steel
6785: Tube & pipe fittings (joints, elbows) of iron/steel
678: Tubes, pipes and fittings, of iron or steel
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