232011 - Bricks blocks tiles and other ceramic products made from siliceous fossil coarse flour or earth - 6 Manufacturer
232012 - Refractory bricks blocks tiles and similar refractory ceramic building materials (except those made - 42 Manufacturer
232013 - Refractory cement mortar concrete and similar mixtures not elsewhere classified - 46 Manufacturer
232014 - Refractory unfired products and other refractory ceramic products - 14 Manufacturer