I21

Articles made from fused silica, fused quartz or glass, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; Fused quartz as a semi-finished product, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; Fused silica as a semi-finished product, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; Partly worked glass, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use