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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 2)
6: Manufactured goods classified chiefly by material
66: Non-metallic mineral manufactures, n.e.s.
662: Clay construct.materials & refractory constr.mater
6623: Refractory bricks & other refract.construct.mater.
66231: Heat-insulating bricks, blocks, tiles & oth.heat-ins
66231: Heat-insulating bricks, blocks, tiles & oth.heat-ins
66231: Heat-insulating bricks, blocks, tiles & oth.heat-ins
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