Copper; refined and copper alloys, unwrought

740311 Copper; refined, unwrought, cathodes and sections of cathodes 740312 Copper; refined, unwrought, wire-bars 740313 Copper; refined, unwrought, billets 740319 Copper; refined, unwrought, n.e.c. in item no. 7403.1 740321 Copper; copper-zinc base alloys (brass) unwrought 740322 Copper; copper-tin base alloys (bronze) unwrought 740329 Copper; copper alloys n.e.c. in heading no. 7403 (other than master alloys of heading no. 7405)