Industry
Bricks, ceramic or clinker, machine pressed and moulded, Glass, cement and ceramics, Minerals, Refractory materials, siliceous, 15 to 25% alumina, Bricks, ceramic or clinker, perforated, airbricks, Refractory materials and their non-shaped products, Refractory materials, synthetic mullite, 45 to 85% alumina, Bricks, facing, ceramic or clinker, Ceramic bricks, Bricks, ceramic or clinker, solid