Manufacture.

(a) By appliances and methods that will assure uniformity of completed containers; dirt and scale to be removed as necessary; no defect acceptable that is likely to weaken the finished container appreciably; reasonably smooth and uniform surface finish required. (b) Seams when used must be as follows: (1) Circumferential seams: By welding, swedging, brazing, soldering, or double seaming. (2) Side seams: By welding, brazing, or soldering. (c) Ends: The ends shall be of pressure design. [29 FR 18823, Dec. 29, 1964, as amended by Order 71, 31 FR 9074, July 1, 1966. Redesignated at 32 FR 5606, Apr. 5, 1967]