7305: Tubes & pipe nes, having int/ext circ cross-sect, ext diam >406.4mm,

730511: Pipe, line, i/s, longitudinally subm arc wld, int/ext cc sect, dia >4 730512: Pipe, line, i/s, longitudinally wld w int/ext circ c sect, ext dia>40 730519: Pipe, line, i or s, int/ext circ cross sect, wld, ext dia >406.4mm, n 730520: Casings, i/s, int/ext circ c sect, wld ext dia >406.4mm, oil/gas dril 730531: Tubes & pipe, i or s, longitudinally welded, external dia >406.4mm, n 730539: Tubes & pipe, i or s, welded, riveted or sim closed, ext dia >406.4mm 730590: Tubes & pipe, i or s, riveted or sim closed, ext dia >406.4mm, nes 7305: Tubes & pipe nes, having int/ext circ cross-sect, ext diam >406.4mm,