(a) No person, firm or corporation in the City shall advertise or hold himself out to the public as a plumber or licensed plumber when such person, firm or corporation does not have such license or registration as provided for in this chapter.
(b) No person, firm or corporation not in legal possession of a valid active master plumber's license issued by the City shall engage in, or represent himself as an active master plumber in the City or expose or use a sign with the words "Master Plumber" or "Plumber" thereon, or to advertise with similar words, for the purpose of implying that he is a master plumber or a plumber.