38In so far as a public entity exercises an economic activity which can be separated from the exercise of its public powers, that entity, in relation to that activity, acts as an undertaking, while, if that economic activity cannot be separated from the exercise of its public powers, the activities exercised by that entity as a whole remain activities connected with the exercise of those public powers (see, to that effect, Case C-113/07 P SELEX Sistemi Integrati v Commission [2009] ECR I-2207, paragraph 72 et seq.).
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