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Article 3 of this Convention shall apply after the expiration of a period not exceeding three years from the date of entry into force of the Convention for the territory where the vessel is registered: Provided that, in the case of a seaman who has had a satisfactory record of two years' service as cook before the expiration of the aforesaid period, national laws or regulations may provide for the acceptance of a certificate of such service as equivalent to a certificate of qualification.