7 Pa. Code § 3.22
The provisions of this § 3.22 issued under sections 9 and 403 of the act of July 22, 1913 (P. L. 928, No. 441) (3 P. S. § § 421 and 430); section 1 of the act of March 28, 1929 (P. L. 110, No. 117) (3 P. S. § 371); section 1702 of The Administrative Code of 1929 (71 P. S. § 442); section 2 of the act of April 17, 1929 (P. L. 533, No. 236) (3 P. S. § 342); and section 1 of the act of June 22, 1931 (P. L. 650, No. 225) (3 P. S. § 431).