3902 90 20 -- Polybut-1-ene, a copolymer of but-1-ene with ethylene containing by weight 10 % or less of ethylene, or a blend of polybut-1-ene with polyethylene and/or polypropylene containing by weight 10 % or less of polyethylene and/or 25 % or less of polypropylene, in one of the forms mentioned in note 6(b) to this chapter - EU Vocabularies

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