7403 Copper, Refined, and Copper Alloys, Unwrought (Excl. Copper Alloys of Heading 7405)

7403 (01/1988-..) Copper, Refined, and Copper Alloys, Unwrought (Excl. Copper Alloys of Heading 7405) 74031100 (01/1988-..) Copper, Refined, in the Form of Cathodes and Sections of Cathodes 74031200 (01/1988-..) Copper, Refined, in the Form of Wire-bars 74031300 (01/1988-..) Copper, Refined, in the Form of Billets 74031900 (01/1988-..) Copper, Refined, Unwrought (Excl. Copper in the Form of Billets, Wire-bars, Cathodes and Sections of Cathodes) 74032100 (01/1988-..) Copper-zinc Base Alloys `brass` Unwrought 74032200 (01/1988-..) Copper-tin Base Alloys `bronze` Unwrought 74032300 (01/1988-12/2006) Copper-nickel Base Alloys `cupro-nickel` or Copper-nickel-zinc Base Alloys `nickel Silver` Unwrought 74032900 (01/2007-..) Copper Alloys Unwrought (Excl. Copper-zinc Base Alloys `brass`, Copper-zinc Base Alloys `bronze`, and Copper Master Alloys of Heading 7405)