this Treaty at such time as such units are made available to the Republic of Panama. (d) upon termination of this Treaty, all real property, and non-removable improvements that were used by the United States of America for the purposes of this Treaty and related agreements, and equipment related to the management, operation and maintenance of the Canal remaining in the Republic of Panama. 3. The Republic of Panama agrees to hold the United States of America harmless with respect to any claims which maybe made by third parties relating to rights, title and interest in such property. - 4. The Republic of Panama shall receive, in addition, from the Panama Canal Commission a just and equitable return on the national resources which it has dedicated to the efficient management, operation, maintenance, protection and defense of the Panama Canal, in accordance with the following: (a) An annual amount to be paid out of Canal operating revenues computed at a rate of thirty hundredths of a United States dollar ($0.30) per Panama Canal net ton, or its equivalency, for each vessel transiting the Canal, after the entry into force of this Treaty, for which tolls are charged. The rate of thirty hundredths of a United States dollar ($0.30) per Panama Canal net ton, or its equivalency, will be adjusted to reflect changes in the United States wholesale price index[ for total manufactured goods during biennial periods. The first adjustment 1 See related letter, p. 102. TIAS 10030