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184 "The expenses of the International Bureau instituted by Article 13 shall be supported by the contracting States in common. They cannot in any event exceed the sum of sixty thousand francs per annum."

The present Protocol shall be ratified, and the ratifications thereof shall be exchanged at Madrid, within aperiod of six months at the latest.

It shall take effect one month after the exchange of ratifications, and shall have the same force and duration as the Convention of March 20, 1883, of which it shall be considered as forming an integral part.

In testimony whereof, the Plenipotentiaries of the States above named have signed the present Protocol at Madrid, the fifteenth day of April, one thousand eight hundred and ninety-one.