7303 Tubes, pipes and hollow profiles, of cast iron

7303 (01/1988-..) Tubes, pipes and hollow profiles, of cast iron 73030010 (01/1988-..) Tubes and pipes of a kind used in pressure systems, of cast iron 73030090 (01/1988-..) Tubes, pipes and hollow profiles, of cast iron (excl. products of a kind used in pressure systems)