A salesman may not represent any contractor unless the salesman complies with the provisions of this regulation. A salesman seeking to represent any contractor shall make application on forms provided by the Commission. A salesman may not represent more than two contractors at any one time. Before the Commission may authorize a salesman to represent two contractors at the same time, the salesman shall provide to the Commission the following: Written notice of appointment or employment signed by both the contractor duly licensed with the Commission and the salesman; and A copy of notification by certified mail, and evidence of its receipt, to each contractor represented by the salesman stating the names and addresses of each contractor represented by the salesman. A contractor shall promptly notify the Commission when his association with any salesman is terminated, and a salesman shall promptly return to the Commission any authorization issued by the Commission to represent the contractor.