Semi-finished crystalline products, namely, filaments, ribbons, tubing, and plates made substantially of monocrystalline aluminum oxides, also known as alumina, for use in the further manufacture of other goods

SHAPED CRYSTALLINE PRODUCTS; NAMELY, FILAMENTS, RIBBONS, TUBING, PLATES, OF SUBSTANTIALLY MONOCRYSTALLINE ALUMINA, (I.E., SAPPHIRE), FOR VARIOUS USES, NOTABLY IN THE FURTHER MANUFACTURE OF OTHER PRODUCTS