Every licensed locksmith or keymaker shall display the license issued thereunder in a conspicuous place where it can be readily seen by anyone entering the premises where the business is conducted. Where the licensed locksmith or keymaker is not in business for himself, but is employed by another, it shall be incumbent upon the licensee and his employer to display the license hereunder in a conspicuous place where it can be readily seen by anyone entering the premises wherein the business is conducted.