The Secretary shall establish a classification of goods and services for convenience of administration of this Article, but not to limit or extend the applicant’s or registrant’s rights, and a single application for registration of a mark may include any or all goods upon which, or services for which, the mark is actually being used indicating the appropriate class or classes of goods or services.  When a single application includes goods or services that fall within multiple classes, the Secretary may require payment of a fee for each class.  The Secretary may amend the classes herein established to conform them to the classification established for the United States Patent and Trademark Office as from time to time amended. (1967, c. 1007, s. 1; 1991, c. 626, s. 9; 1997-476, s. 11.)