63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (3) Expenses incurred by laboratories and technical installa- tions of the Union, in measurements, testing, or special research for individual Members or Associate Members, groups of Members or Associate Members or regional organizations or others, shall be borne by those Members or Associate Members, groups, organizations or others. 4. For the purpose of apportioning expenses, Members and Associ- pportonment a ate Members shall be divided into 8 classes, each contributing on the basis of a fixed number of units, namely: 1st class: 30 units, 5th class: 10 units, 2nd class: 25 units, 6th class: 5 units, 3rd class: 20 units, 7th class: 3 units, 4th class: 15 units, 8th class: 1 unit. 5. Each Member and Associate Member shall inform the Secre- tary General of the class in which it wishes to be included. This de- cision shall be notified to the other Members and Associate Members by the Secretary General and shall not be changed during the interval between the coming into force of this Convention and the opening of the next Plenipotentiary Conference. 6. Members and Associate Members shall pay in advance their annual contributory shares calculated on the basis of the estimated expenditure of the Union for the following financial year. 7. The amounts due shall bear interest from the beginning of each Interst. financial year of the Union with regard to ordinary expenses and from the date on which accounts for extraordinary expenses, and for documents supplied, are sent to Members and Associate Members. This interest shall be at the rate of 3% (three per cent) per annum during the first six months after the date on which the amounts are due and at the rate of 6% (six per cent) per annum from the beginning of the seventh month. Article 15 Languages 1. (1) The official languages of the Union shall be Chinese, English, French, Russian and Spanish. (2) In case of dispute, the French text shall be authentic. Authentic tet. 2. The final documents of the plenipotentiary and administrative conferences as well as the final acts and protocols, shall be drawn up in the languages mentioned above in versions equivalent in form and content. 3. (1) All other documents of the conferences shall be drawn up in English, French and Spanish. (2) All service documents of the Union shall be published in service documents. the five official languages. (3) All other documents for general distribution prepared by Doaments fogten- the Secretary General in the course of his duties shall be drawn up in English, French and Spanish. 1433
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