§ 822.
The right to alter, amend, or repeal this chapter is expressly reserved; but no such alteration, amendment, or repeal shall affect any license theretofore issued under the provisions of this chapter or the rights of any licensee thereunder.
([June 10, 1920, ch. 285], pt. I, § 28, [41 Stat. 1077]; renumbered pt. I, [Aug. 26, 1935, ch. 687], title II, § 212, [49 Stat. 847].)