37With respect to general rule 3(b) for the interpretation of the CN, it must be recalled that, under that rule, in carrying out the tariff classification of goods it is necessary to identify, from among the materials of which they are composed, the one which gives them their essential character; this may be done by determining whether the goods would retain their characteristic properties if one or other of their constituents were removed (Case C-250/05 Turbon International [2005] ECR I-10531, paragraph 21 and the case‑law cited, and Case C-173/08 Kloosterboer Services [2009] ECR I-5347, paragraph 31).
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