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" Subject to the provisions of this section , the President , for a period of four years after July 29 , 1958 , may transfer to the Administration any functions ( including powers , duties , activities , facilities , and parts of functions ) of any other department or agency of the United States , or of any officer or organizational entity thereof , which relate primarily to the functions , powers , and duties of the Administration as prescribed by section 2473 of this title . He took office on July 1 , 1958 . July 24 , 1958 An agreement was reached between the Railroad Board and the Department of Health , Education and Welfare whereby the Board would make disability " freeze " determinations for career railroad workers conclusive only for the purpose of determining benefit payments under the railroad retirement program while DHEW would continue to make disability " freeze " determinations for all Social Security benefit purposes and for purposes of the financial interchange provisions .