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owners and with the bona fide trade unions of seafarers, require such alterations for the purpose of bringing the ship into conformity with the requirements of the Convention as it deems possible having regard to the practical problems involved ; such alterations shall constitute final compliance with the terms of this Convention, unless and until the ship be reregistered. Part Y. —Final Provisions Article 19 Nothing in this Convention shall affect any law, award, custom or agreement between shipowners and seafarers which ensures more favourable conditions than those provided for by this Convention. Article 20 The formal ratifications of this Convention shall be communicated to the Director of the International Labour Office for registration. Article 21 1. This Convention shall be binding only upon those Members of the International Labour Organization whose ratifications have been registered with the Director. 2. It shall come into force six months after the date on which there have been registered ratifications by seven of the following countries : United States of America, Argentine Republic, Australia, Belgium, Brazil, Canada, Chile, China, Denmark, Finland, France, United Kingdom of Great Britain and Northern Ireland, Greece, India, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Sweden, Turkey and Yugoslavia, including at least four countries each of which has at least one million gross register tons of shipping. This provision is included for the purpose of facilitating and encouraging early ratification of the Convention by Member States. 3. Thereafter, this Convention shall come into force for any Member six months after the date on which its ratification has been registered. Article 22 1. A Member which has ratified this Convention may denounce it after the expiration of ten years from the date on which the Convention comes into force, by an act communicated to the Director of the International Labour Office for registration. Such denunciation shall not take effect until one year after the date on which it is registered. 2. Each Member which has ratified this Convention and which does not, within the year following the expiration of the period of ten years mentioned in the preceding paragraph, exercise the right of denunciation provided for in this Article, will be bound for another period of ten years and, thereafter, may denounce this Convention at the expiration of each period of ten years under the terms provided for in this Article. Article 23 1. The Director of the International Labour Office shall notify all the Members of the International Labour Organization of the registration of all ratifications and denunciations communicated to him by the Members of the Organization. 2. When notifying the Members of the Organization of the registration of the last of the ratifications required to bring the Convention into force, the Director shall draw the attention of the Members of the Organization to the date upon which the Convention will come into force.

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