80In that regard, it should be recalled that the phrase ‘initiation by the Commission of proceedings’ in Article 11(6) of Regulation No 1/2003 concerns an act of the Commission by which it announces to an undertaking its intention to bring proceedings in order to adopt one of the decisions referred to in Chapter III of that regulation. That act determines the extent to which the Commission relieves the national competition authorities of their competence. Therefore, in order for the application of Article 11(6) to be clear, the act initiating the investigation proceedings must specify the infringement allegedly committed by one or more undertakings during one or more periods on one or more product markets and one or more geographic markets which that act concerns (see, to that effect, judgment of 25 February 2021, Slovak Telekom, C‑857/19, EU:C:2021:139, paragraphs 27 to 29).
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