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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
First part: Rules for the Control of Wireless Telegraphy in Time of War. - Art. 3.
The installation or the operation of wireless stations, within a neutral jurisdiction, by a belligerent Power or by persons in its services, constitutes a violation of neutrality on the part of that belligerent as well as a breach of neutrality on the part of the neutral Power which permits the installation or the operation of such stations.