86It is settled case-law that requests for information made by the Commission to an undertaking must comply with the principle of proportionality and the obligation imposed on an undertaking to supply information should not be a burden on that undertaking which is disproportionate to the needs of the inquiry (SEP v Commission, paragraph 36 above, paragraph 51; Atlantic Container Line and Others v Commission, paragraph 72 above, paragraph 418; and Slovak Telekom v Commission, paragraph 39 above, paragraph 81).
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