The nature of tariff changes and revisions are depicted by the letter-symbols which appear under the “symbol” column. The letter-symbols and their significance are as follows:
AR Denotes the addition of a new tariff rate not previously published.
MR Denotes the modification or correction of a tariff rate.
RR Denotes that the rate has been reviewed and that no changes are necessary.
AW Denotes the addition of a new paragraph, new note, or new wording.
MW Denotes the modification or correction of a paragraph, note or wording.
RW Denotes that the wording has been reviewed and that no changes are necessary.
CN Denotes a change of tariff item number.
+ A plus sign following the letter symbol MR, MW o CN indicates the tariff rate has been increased.
- A minus sign following the letter symbol MR, MW o CN indicates the tariff rate has been decreased.
