(July 14, 1955, ch. 360, title III, § 311, formerly § 11, as added Pub. L. 88–206, § 1, Dec. 17, 1963, 77 Stat. 401; renumbered § 304, Pub. L. 89–272, title I, § 101(4), Oct. 20, 1965, 79 Stat. 992; amended Pub. L. 90–148, § 2, Nov. 21, 1967, 81 Stat. 505; renumbered § 311 and amended Pub. L. 91–604, §§ 12(a), 15(c)(2), Dec. 31, 1970, 84 Stat. 1705, 1713.)