36Although, admittedly, the Commission is obliged to indicate as precisely as possible the evidence sought and the matters to which the investigation must relate (Roquette Frères, EU:C:2002:603, paragraph 83 and the case-law cited), it is, on the other hand, not essential in a decision ordering an inspection to define precisely the relevant market, to set out the exact legal nature of the presumed infringements or to indicate the period during which those infringements were committed, provided that that inspection decision contains the essential elements set out above (see, to that effect, Dow Chemical Ibérica and Others v Commission, EU:C:1989:380, paragraph 46, and Roquette Frères, EU:C:2002:603, paragraph 82).
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