Section 1 of Joint Res. Mar. 31, 1953, ch. 13, 67 Stat. 18, provided for the extension of certain emergency provisions (previously extended to April 1, 1953 by Joint Res. July 3, 1952, ch. 570, § 1(b), 66 Stat. 333) until July 1, 1953. Section 2 of Joint Res. Mar. 31, 1953, provided that the extension did not apply to the provisions of sections 223 to 226b of this title.