Artikel 20

The present Convention, of which the French and English texts are both authentic, shall bear to-day's date. Until the 31st of December 1929, it shall be open for signature on behalf of any Member of the League of Nations and on behalf of any non-member State which was represented at the Conference which elaborated the present Convention or to which a copy is communicated by the Council of the League of Nations.
It shall be ratified, and the instruments of ratification shall be transmitted to the Secretary-General of the League of Nations, who will notify their receipt to all the Members of the League and to the non-member States aforesaid.