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Rh The expense of the international Bureau shall be borne in common by the contracting countries. They may not, in any case, exceed the sum of sixty thousand francs per year.

In order to determine the contributive part of each of the countries in this sum total of the expenses, the contracting countries and those which later join the Union shall be divided into six classes, each contributing in proportion to acertain number of units, to-wit:

These coefficients shall be multiplied by the number of countries of each class, and the sum of the products thus obtained will furnish the number of units by which the total expenses are to be divided. The quotient will give the amount of the unit of expense.

Each of the contracting countries shall designate at the time of its accession, the class in which it wishes to be ranked.

The Government of the Swiss Confederation shall supervise the expenses of the international Bureau, make necessary advances and draw up annual statements of accounts which shall be communicated to all the other Administrations.

The present Convention shall be submitted to periodical revisions with a view to introducing improvements in it of a nature to perfect the system of the Union.

To this end Conferences of the delegates of the contracting countries shall be held successively in one of the said countries.

The Administration of the country where the Conference is to be held shall prepare, with the concurrence of the international Bureau the works of such Conference.

The Director of the international Bureau will assist at the meetings of the Conferences and take part in the discussions without a vote.

It is understood that the contracting countries reserve to themselves respectively the right to make separately, between themselves, special arrangements for the protection of industrial Property, in so far as these arrangements may not interfere with the provisions of the present Convention.

The countries which have not taken part in the present Convention shall be permitted to adhere to it upon their request.