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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 17. In neutral ports and roadsteads belligerent war-ships may only carry out such repairs as are absolutely necessary to render them seaworthy, and may not add in any manner whatsoever to their fighting force. The local authorities of the neutral Power shall decide what repairs are necessary, and these must be carried out with the least possible delay.