46According to settled case-law, although it is true that Articles 81 EC and 82 EC are, in themselves, concerned solely with the conduct of undertakings and not with laws or regulations emanating from Member States, those articles, read in conjunction with Article 10 EC, which lays down a duty to cooperate, none the less require Member States not to introduce or maintain in force measures, even of a legislative or regulatory nature, which may render ineffective the competition rules applicable to undertakings (see, in particular, the order in Case C-250/03 Mauri [2005] ECR I-1267, paragraph 29, and the case-law cited).
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