23.20.12.35 - Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, > 7 % but < 45 % alumina, but > 50 % by weight combined with silica
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, > 7 % but < 45 % alumina, but > 50 % by weight combined with silica
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