49The administrative nature of the proceedings in the main suit is also confirmed by Article 29(4) of the Law establishing the CNMC which provides that the adoption of a decision by the Board of the CNMC puts an end to the proceedings which are expressly qualified as ‘administrative’. In addition, under Article 48(1) of the Law on the protection of competition, an action before the administrative courts may be brought against such a decision, during which the CNMC, as was pointed out in particular by the Spanish Government in its written observations, acts as a defendant in the court proceedings at first instance before the Audiencia Nacional (National High Court, Spain) or as an appellant or respondent in the event of an appeal against the judgment of the Audiencia Nacional before the Tribunal Supremo (Supreme Court, Spain).
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