2. Without prejudice to specific needs regarding the availability of data defined in Union or national law, a data holder may decline or seek the modification of a request to make data available under this Chapter without undue delay and, in any event, no later than five working days after the receipt of a request for the data necessary to respond to a public emergency and without undue delay and, in any event, no later than 30 working days after the receipt of such a request in other cases of an exceptional need, on any of the following grounds:
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(a)
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the data holder does not have control over the data requested;
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(b)
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a similar request for the same purpose has been previously submitted by another public sector body or the Commission, the European Central Bank or a Union body and the data holder has not been notified of the erasure of the data pursuant to Article 19(1), point (c);
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(c)
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the request does not meet the conditions laid down in Article 17(1) and (2).
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