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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. 5.
Art. 5. Belligerent mobile wireless stations, when they are within a neutral jurisdiction, must abstain from any use of their wireless apparatus.
The neutral governments are bound to employ the means at their disposal in order to prevent such use.