Treaties and other international acts series. 5049. Technical cooperation, special technical services, agreement between United States and Brazil, signed at Rio de Janeiro May 30, 1953; [entered into force provisionally May 30, 1953, entered into force definitively Nov. 13, 1959, and extending agreement effected by exchange of notes signed Rio de Janeiro Dec. 31, 1960; entered into force provisionally Dec. 31, 1960.]