6902 Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods (Excl. Those of Siliceous Fossil Meals or Similar Siliceous Earths)

6902 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods (Excl. Those of Siliceous Fossil Meals or Similar Siliceous Earths) 69021000 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods Containing, by Weight, Singly or Together, > 50% of the Elements mg, ca or cr, Expressed as Mgo, cao or Cr2o3 69022010 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods Containing, by Weight, >= 93% Silica (Excl. Those of Siliceous Fossil Meals or Similar Siliceous Earths) 69022091 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods Containing, by Weight, > 7% but < 45% Alumina, but > 50% by Weight Combined With Silica 69022099 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods Containing, by Weight, > 50% Alumina, Silica or a Mixture or Compound of These Products (Excl. Containing, by Weight, >= 93% Silica, > 7% but < 45% Alumina and Those OfSiliceous Fossil Meals or Similar Siliceous Earths) 69029000 (01/1988-..) Refractory Bricks, Blocks, Tiles and Similar Refractory Ceramic Constructional Goods (Excl. Containing, by Weight, Singly or Together, > 50% of the Elements mg, ca or cr, Expressed as Mgo, cao or Cr2o3, Containing, by Weight, > 50% Alumina, Silica or a MIxture or Compound of These Products and Those of Siliceous Fossil Meals or Similar Siliceous Earths)