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Convention (V) respecting the Rights and Duties of Neutral Powers and Persons in Case of War on Land. The Hague, 18 October 1907.
Chapter I : The rights and duties of neutral powers - Art. 9.
Art. 9. Every measure of restriction or prohibition taken by a neutral Power in regard to the matters referred to in Articles 7
must be impartially applied by it to both belligerents.
A neutral Power must see to the same obligation being observed by companies or private individuals owning telegraph or telephone cables or wireless telegraphy apparatus.