Rules of practice and procedure in administration of sec. 332, 336, 337, and 338, pt. 2, title 3, tariff act of 1930, and Laws relating to Tariff Commission, sec. 330-341, pt. 2, title 3, tariff act of 1930. Revised and promulgated Nov. 25, 1930, 2d revision, June 1, 1931.