22 Pa. Code § 21.54
The provisions of this § 21.54 adopted October 2, 1970, effective October 3, 1970, 1 Pa.B. 324; amended October 6, 1972, effective October 7, 1972, 2 Pa.B. 1889; reserved April 22, 1977, effective April 23, 1977, 7 Pa.B. 1084. Immediately preceding text appears at serial page (7366).