T.D. ATF-6, 38 FR 32445, 11/26/1973, as amended by T.D. ATF-48, 43 FR 13531, 3/31/1978; 44 FR 55841, 9/28/1979. Redesignated by T.D. ATF-301, 55 FR 47606, 11/14/1990; T.D. ATF-312, 56 FR 31085, 7/9/1991; T.D. ATF-450, 66 FR 29024, 5/29/2001; 86 FR 34958, 7/1/2021