Council in accordance with paragraph 4 of this Article. 7. The provisions of paragraph 1 of this Article shall also apply to the customs or economic unions referred to in Article 9 of this convention in so far as the obligations arising from the instruments establishing such customs or economic unions require the competent bodies thereof to contract in their own name. However, such bodies shall not have the right to vote. Article 12 1. This convention shall enter into force three months after five of the States referred to in paragraph 1 of Article 11 thereof have signed the convention without reservation of ratification or have deposited their instruments of ratification or accession. 2. For any State signing without reservation of ratification, ratifying or acceding to this convention after five States have signed it without reservation of ratification or have deposited their instruments of ratification or accession, this convention shall enter into force three months after the said State has signed without reservation of ratification or deposited its instrument of ratification or accession. 3. Any Annex to this convention shall enter into force three months after five Contracting Parties have accepted that Annex. 4. For any State which accepts an Annex after five States have accepted it, that Annex shall enter into force three months after the said State has notified its acceptance. Article 13 1. Any State may, at the time of signing this convention without reservation of ratification or of depositing its instrument of ratification or accession, or at any time thereafter, declare by notification given to the Secretary-General of the Council that this convention shall extend to all or any of the territories for whose international relations it is responsible. Such notification shall take effect three months after the date of the receipt thereof by the Secretary-General of the Council. However, the convention shall not apply to the territories named in the notification before the convention has entered into force for the State concerned. 2. Any State which has made a notification under paragraph 1 of this Article extending this convention to any territory for whose international relations it is responsible may notify the Secretary-General of the Council, under the procedure of Article 14 of this convention, that the territory in question will no longer apply the convention. Article 14 1. This convention is of unlimited duration but any Contracting Party may denounce it at any time after the date of its entry into force under Article 12 thereof. 2. The denunciation shall be notified by an instrument in writing, deposited with the Secretary-General of the Council. 3. The denunciation shall take effect six months after the receipt of the instrument of denunciation by the Secretary-General of the Council. 4. The provisions of paragraphs 2 and 3 of this Article shall also apply in respect of the Annexes to this convention, any Contracting Party being entitled, at any time after the date of their entry into force under Article 12 of the convention, to withdraw its acceptance of one or more Annexes. Any Contracting Party which withdraws its acceptance of all the Annexes shall be deemed to have denounced the convention. Article 15 1. The Council may recommend amendments to this convention. Every Contracting Party shall be invited by the Secretary-General of the Council to participate in the discussion of proposals for amendment of this convention. 2. The text of any amendment so recommended shall be communicated by the Secretary-General of the Council to all Contracting Parties to this convention, to the other signatory States and to those Member States of the Council that are not Contracting Parties to this convention. 3. Within a period of six months from the date on which the recommended amendment is so communicated, any Contracting Party or, if the amendment affects an Annex in force, any Contracting Party bound by that Annex may inform the Secretary-General of the Council: (a) that it has an objection to the recommended amendment, or (b) that, although it intends to accept the recommended amendment, the conditions necessary for such acceptance are not yet fulfilled in its country. 4. If a Contracting Party sends the Secretary-General of the Council a communication as provided for in paragraph 3 (b) of this Article, it may, so long as it has not notified the Secretary-General of its acceptance of the recommended amendment, submit an objection to that amendment within a period of nine months following the expiry of the six-month period referred to in paragraph 3 of this Article. 5. If an objection to the recommended amendment is stated in accordance with the terms of paragraph 3 or 4 of this Article, the amendment shall be deemed not to have been accepted and shall be of no effect. 6. If no objection to the recommended amendment in accordance with paragraph 3 or 4 of this Article has been stated, the amendment shall be deemed to have been accepted as from the date specified below: (a) if