(As amended Dec. 28, 1939, eff. Apr. 3, 1941; Dec. 27, 1946, eff. Mar. 19, 1948; Dec. 29, 1948, eff. Oct. 20, 1949; Apr. 30, 1951, eff. Aug. 1, 1951; Jan. 21, 1963, eff. July 1, 1963; Feb. 28, 1966, eff. July 1, 1966; Dec. 4, 1967, eff. July 1, 1968; Mar. 1, 1971, eff. July 1, 1971; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 23, 2001, eff. Dec. 1, 2001; Apr. 29, 2002, eff. Dec. 1, 2002; Apr. 30, 2007, eff. Dec. 1, 2007; Mar. 26, 2009, eff. Dec. 1, 2009.)