Ceramic materials in the form of filaments, rods, tubes, blocks, plates, discs (rounds); ceramic materials combined with metal, the ceramic predominating or in equal proportion, and ceramic materials combined with other non-metallic materials, all in the form of filaments, rods, tubes, blocks, plates, discs (rounds), sheets, strips and of shaped sections; pipes and partly wrought articles, all of non-metallic and metallic materials, the non-metallic materials predominating or in equal proportions; all for use in building and civil engineering constructions; refractory building materials.;
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