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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. 2.
Art. 2. The belligerent and neutral Powers may regulate or forbid the use of the wireless stations within their jurisdiction.