7020 Articles of Glass, N.e.s.

7020 (01/1988-..) Articles of Glass, N.e.s. 70200005 (01/1998-..) Quartz Reactor Tubes and Holders Designed for Insertion Into Diffusion and Oxidation Furnaces for Production of Semiconductor Materials 70200007 (01/2007-..) Unfinished Glass Inners, for Vacuum Flasks or for Other Vacuum Vessels, Unfinished 70200008 (01/2007-..) Finished Glass Inners, for Vacuum Flasks or for Other Vacuum Vessels, Finished 70200010 (01/1988-..) Glassware of Fused Quartz or Other Fused Silica, N.e.s. 70200030 (01/1988-..) Articles of Glass Having a Linear Coefficient of Expansion <= 5 x 10 -6 per Kelvin Within a Temperature Range of 0??c to 300??c, N.e.s. (Excl. Glassware of Fused Quartz or Other Fused Silica) 70200080 (01/1998-..) Articles of Glass, N.e.s. 70200090 (01/1988-12/1997) Articles of Glass, N.e.s. (Excl. Articles of Glass Having a Linear Coefficient of Expansion =< 5 x 10 -6 per Kelvin Within a Temperature Range of 0 to 300. c or Glassware of Fused Quartz or Other Fused Silica)