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 55 STAT.] NORTH AMERICAN-REGIONAL BROADCASTING-DEC. 13, 1937 mated or such new station shall not have actually commenced continu- ous operation. (b) In special cases in which circumstances beyond the control of the Administration concerned have prevented the completion of the change or the construction of the new station, the term of the original notification may be extended for a period of six months. 6. Bern Bureau. The foregoing notifications shall be made in- dependently of and in addition to those which, under current practice, are sent to the Bureau of the International Telecommunications Union. IV ARBITRATION In case of disagreement between two or more contracting Govern- ments concerning the execution of this Agreement the dispute, if it is not settled through diplomatic channels, shall be submitted to arbitration at the request of one of the Governments in disagreement. Unless the parties in disagreement agree to adopt a procedure already established by treaties concluded between them for the settlement of international disputes, the procedure shall be that provided for in Article 15 of the International Telecommunications Convention of 49Stat. 23. Madrid, 1932. V RATIFICATION, EXECUTION, AND DENUNCIATION 1. Ratification. To be valid this Agreement must be ratified by Canada, Cuba, Mexico and the United States of America. If and when three of said four countries shall have ratified and the fourth shall, through unavoidable circumstances, have been unable to ratify but shall have signified to those countries that have ratified, its readiness, pending ratification and as an administrative measure, to put the provisions of this Agreement (including the contents of Appendix I) into effect in whole or in part, then such country, together P loV. w with those countries which shall have ratified, may, by administrative agreement between them, fix a definite date on which they shall give effect to such provisions, which date shall preferably be one year from the date of such administrative agreement. The ratifications must be deposited, as soon as possible, through diplomatic channels, in the archives of the Government of Cuba. This same Government shall, through diplomatic channels, notify the other signatory Governments of the ratifications as soon as they are received. 2. Effect of ratification. This Agreement shall be valid only as between such countries as shall have ratified it. 3. Execution. The contracting Governments undertake to apply the provisions of this Agreement, and to take the steps necessary to enforce said provisions upon the private operating agencies recognized or authorized by them to establish and operate broadcast stations within their respective countries. 1017

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