There is a newer version of the Maryland Code
Maryland Business Occupations and Professions Section 12-504
§ 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.
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