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.