80In that respect, it must be recalled that the obligation under Article 20(4) of Regulation No 1/2003 to specify the subject-matter and purpose of the inspection constitutes a fundamental guarantee of the rights of defence of the undertakings concerned and, consequently, the scope of the duty to state the reasons for inspection decisions may not be limited by reference to considerations relating to the effectiveness of the investigation. Whilst it is indeed the case that the Commission is not required to communicate to the addressee of such a decision all the information at its disposal concerning the presumed infringements, or to delimit precisely the relevant market, or to set out the exact legal nature of the infringements, or to indicate the period during which those infringements were committed, it is obliged to state, as precisely as possible, the presumed facts that it intends to investigate, that is to say, what it is looking for and the matters to which the inspection must relate (see, to that effect, judgments in Hoechst v Commission, paragraph 79 above, EU:C:1989:337, paragraph 41; of 17 October 1989 in Dow Benelux v Commission, 85/87, ECR, EU:C:1989:379, paragraph 10; and in Roquette Frères, paragraph 23 above, EU:C:2002:603, paragraph 48).
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