8101 Tungsten `wolfram` and Articles Thereof, N.e.s., Tungsten Waste and Scrap (Excl. ash and Residues Containing Tungsten)

8101 (01/1988-..) Tungsten `wolfram` and Articles Thereof, N.e.s., Tungsten Waste and Scrap (Excl. ash and Residues Containing Tungsten) 81011000 (01/1988-..) Tungsten Powders 81019110 (01/1988-12/2001) Unwrought Tungsten, Incl. Bars and Rods of Tungsten Obtained Simply by Sintering 81019190 (01/1988-12/2001) Tungsten Waste and Scrap (Excl. ash and Residues Containing Tungsten) 81019200 (01/1988-12/2001) Tungsten Bars and Rods Other Than Those Obtained Simply by Sintering, Profiles, Plates, Sheets, Strip and Foil N.e.s. 81019300 (01/1988-12/2001) Tungsten Wire 81019400 (01/2002-..) Unwrought Tungsten, Incl. Bars and Rods of Tungsten Obtained Simply by Sintering 81019500 (01/2002-12/2006) Tungsten Bars and Rods (Other Than Those Obtained Simply by Sintering), Profiles, Plates, Sheets, Strip and Foil, N.e.s. 81019600 (01/2002-..) Tungsten Wire 81019700 (01/2002-..) Tungsten Waste and Scrap (Excl. ash and Residues Containing Tungsten) 81019900 (01/1988-12/2006) Articles of Tungsten, N.e.s. 81019910 (01/2007-..) Tungsten Bars and Rods (Other Than Those Obtained Simply by Sintering), Profiles, Plates, Sheets, Strip and Foil, N.e.s. 81019990 (01/2007-..) Articles of Tungsten, N.e.s.