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a). The present Agreement shall be open for signature by Member States and shall be subject to ratification, acceptance or approval. Instruments of ratification, acceptance or approval shall be deposited with the Government of the Kingdom of Belgium which shall notify all signatory States of the deposit of each such instrument;
b). As soon as two or more signatory States, including the Member State in whose territory the Organization has its Headquarters, have deposited their instruments of ratification, acceptance or approval, the present Agreement shall come into force in respect of those States. It shall come into force in respect of each other signatory State on the date of the deposit of its instrument.