(1) All tariffs, time schedules and supplements thereto must be in book, pamphlet, or loose-leaf form of size 8 by 11 inches and must be plainly printed or typed on bond paper or other plain paper of durable quality. Xerox, mimiograph or other similar durable process may be used, provided copies posted and filed are clear and legible in all respects.

(2) Alterations in writing or erasures must not be made in tariffs filed with the commission.

(3) A margin of not less than five-eights of an inch without any printing thereon must be allowed at the binding edge of each tariff.