7304: Tubes, pipes and hollow profiles, seamless, or iron or steel

730410: Pipes, line, iron or steel, smls, of a kind used for oil or gas pipel 730421: Drill Pipe, Seamless, of A Kind Used In Drilling For oil or Gas, of Iron or Steel 730429: Casing and Tubing of used In Drilling For oil or Gas, Seamless, of Iron or Steel 730431: Tubes, pipe & hollow profiles, i/nas, smls, cd/cr, of circ cross sect 730439: Tubes, pipe & hollow profiles, i or nas, smls, of circ cross section, 730441: Tube, pipe & hollow profile, stain steel, smls, cd/cr of circ cross s 730449: Tubes, pipe & hollow profiles, stainless steel, smls, of circ cross s 730451: Tubes, pipe & hollow profile, as, (o/t stain) smls, cd/cr of circ cro 730459: Tube, pipe & hollow profile, as, (o/t stainless) smls, circ cross sec 730490: Tubes, pipe & hollow profiles, iron or steel, smls, nes 7304: Tubes, pipes and hollow profiles, seamless, or iron or steel