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Convention on Maritime Neutrality. Havana, 20 February 1928.
Section III : Rights and duties of neutrals - Art. 16.
Art. 16. The neutral state is forbidden:
(a) To deliver to the belligerent, directly or indirectly, or for any reason whatever, ships of war, munitions or any other war material;
(b) To grant it loans, or to open credits for it during the duration of war.
Credits that a neutral state may give to facilitate the sale or exportation of its food products and raw materials are not included in this prohibition.