§ 12-504
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/md/business-occupations-and-professions/12-504·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
§12–504.
Each plumbing advertisement in the name of a person who engages in the business of providing plumbing services shall contain the license number and name of a master plumber or holder of a limited master plumber license whom the person employs and designates to direct and control the provision of plumbing services through the business of the person.