Civil aeronautics law Law no. 231 of July 15, 1952 as amended by Law no.278 of 1952, no.66 of 1953, no. 151 of 1953, no. 60 of 1954, no. 63 of 1958, no. 40 of 1959, no. 90 of 1960 : cabinet Order relating to the enforcement of Civil aeronautics law. (Hobunshorin, 1962)