27As the Court has already held, within the system of the EC Treaty, Article 90 EC supplements the provisions on the abolition of customs duties and charges having equivalent effect. Its aim is to ensure free movement of goods between the Member States in normal conditions of competition by the elimination of all forms of protection which may result from the application of internal taxation that discriminate against products from other Member States (Joined Cases C-393/04 and C-41/05 Air Liquide Industries Belgium [2006] ECR I-5293, paragraph 55, and the case-law cited, and Nádasdi and Németh, paragraph 45).
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