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Article 247

This Treaty shall be ratified by the High Contracting Parties in accordance with their respective constitutional requirements . The instruments of ratification shall be deposited with the Government of the Italian Republic .

This Treaty shall enter into force on the first day of the month following the deposit of the instrument of ratification by the last signatory State to take this step . If , however , such deposit is made less than fifteen days before the beginning of the following month , this Treaty shall not enter into force until the first day of the second month after the date of such deposit .