(1) When a change of the same character is made in all or in substantially all rates in a tariff or supplement or a page thereof, that fact and the nature of such change may be indicated in distinctive type at the top of the title page of such issue, or at the top of each page, respectively, in the following manner: "All rates in this issue are increases," or "All rates on this page are reductions except as otherwise provided in connection with the rates."

(2) Under this rule the appropriate symbol from the tariff's approved symbols page must be used to symbolize a rate in which no change has been made. This symbol must not be used for any other purpose.