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The provisions of this Convention shall extend or be applicable equally to all non-self-governing, trust or other territories for the international relations of which a Contracting Party is responsible, unless the latter, on ratifying or acceding to this Convention, has given notice that the Convention shall not apply to any one or more of such territories. Any Contracting Party making such a declaration may, at any time thereafter, by notification to the Secretary-General, extend the application of the Convention to any or all of such territories.