§ 504.
([June 19, 1934, ch. 652], title V, § 504, [48 Stat. 1101]; [May 20, 1937, ch. 229, § 14], [50 Stat. 197]; [June 25, 1948, ch. 646, § 1], [62 Stat. 909]; [Aug. 13, 1954, ch. 735, § 4], [68 Stat. 729]; [Aug. 6, 1956, ch. 973, § 2], [70 Stat. 1048]; [Pub. L. 86–752, § 7(b)]–(d), Sept. 13, 1960, [74 Stat. 895]; [Pub. L. 87–448, § 2], May 11, 1962, [76 Stat. 69]; [Pub. L. 95–234, § 3], Feb. 21, 1978, [92 Stat. 35]; [Pub. L. 96–507, § 2(c)], Dec. 8, 1980, [94 Stat. 2747].)