Md. Code Ann., Bus. Occ. & Prof. § 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.
Added by Acts 1989, c. 3, § 1, eff. Oct. 1, 1989.
Formerly Art. 56A, § 3-504.