Tariffs, revisions and supplements, shall be printed or typewritten on hard calendered paper of good quality, 8-1/2 by 11 inches in size, from type of size not less than six point full face. Alterations in writing or erasures may not be permitted. Reproduction processes resulting in a permanent record are acceptable, but tariffs or supplements prepared in hectograph impression, or by other means which do not result in a permanent record, will not be accepted.
52 Pa. Code § 53.1
This section cited in 52 Pa. Code § 53.21 (relating to title page).