Artikel 9

1. This Arrangement shall be open for signature by the Governments until 1 January 1969.
2. The Governments shall become parties to this Arrangement:
- upon signature not subject to ratification or approval;
- upon depositing an instrument of ratification or approval with the Government of the French Republic, if this Arrangement was signed subject to ratification or approval.
3. This Arrangement shall come into force when it has been signed by the Organisation and when the Governments, whose shares on the scale set out in the Appendix to Annex B amount to 90 %, have become parties to this Arrangement in accordance with paragraph 2 of this Article.
4. For the purpose of paragraph 3 of this Article, the deposit of a declaration of intention to apply the Arrangement provisionally and to seek ratification or approval, as soon as possible shall be considered as the deposit of an instrument of ratification or approval.
5. Any Government of a Member State of the Organisation which has not signed the Arrangement by 1 January 1969, may become a party to the Arrangement after it has come into force provided
a. the other Governments party to the Arrangement agree and
b. the Government in question deposits an instrument of accession with the Government of the French Republic.
6. On becoming a party to this Arrangement after its entry into force, a Government shall contribute the amount that it would have contributed had it been a party to the Arrangement at the moment of its entry into force, and such amounts shall be credited pro rata to the other Parties in the special account.