The clerk of each court of quarter sessions shall publish, at least once in each year, a roster of the names and addresses of all persons, partnerships, associations and corporations licensed by such court under the provisions of this act. A copy of each roster published by each clerk shall be mailed by him to any licensee upon request and without charge, and a copy of each such roster shall also be mailed by him to the commissioner, who shall keep a roster of the names and addresses of all persons, partnerships and corporations in the Commonwealth of Pennsylvania under the provisions of this act. A copy of the roster kept by the commissioner shall be mailed by him to any licensee upon request and without charge.