Sections 1.593-1 and 1.593-2 apply only to taxable years beginning after December 31, 1953, and ending after August 16, 1954, but before January 1, 1963, and all references to sections of the Code are to the Internal Revenue Code of 1954 before amendment by the Revenue Act of 1962. Sections 1.593-4 through 1.593-11 apply only to taxable years ending after December 31, 1962, and all references to sections of the Code are to the Internal Revenue Code of 1954 after amendment by the Revenue Act of 1962. [T.D. 6728, 29 FR 5857, May 5, 1964]