49 C.F.R. § 178.33a-9
(a) By means of printing, lithographing, embossing, or stamping, each container must be marked to show:
[Amdt. 178-40, 41 FR 38181, Sept. 9, 1976, as amended by Amdt. 178-97, 56 FR 66287, Dec. 20, 1991; 66 FR 45386, Aug. 28, 2001]