If a claim for drawback of tax is not allowed in full, the appropriate TTB officer shall notify the claimant in writing of the reasons for any disallowance. (46 Stat. 690, as amended, 48 Stat. 999, as amended, 72 Stat. 1335, 1336; 19 U.S.C. 1309, 81c, 26 U.S.C. 5055, 5062) [25 FR 5734, June 23, 1960. Redesignated at 40 FR 16835, Apr. 15, 1975, and amended by T.D. ATF-62, 44 FR 71726, Dec. 11, 1979; T.D. TTB-8, 69 FR 3835, Jan. 27, 2004]