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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 3)
6: Manufactured goods
66: Non metallic mineral manufactures, n.e.s.
662: Clay construction, refracto. construction materials
6623: Refractory construction materials (e.g. bricks)
6623: Refractory construction materials (e.g. bricks)
66231: Bricks, tiles & other ceramic goods, siliceous meals
66232: Refractory bricks, simi. refract. goods (excluding66231)
66233: Refractory cements & similar compositions, n.e.s.
6623: Refractory construction materials (e.g. bricks)
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