Md. Code, Business Occupations and Professions § 4–309

(a) Subject to § 4–605 of this title, while a master barber license is in effect, it authorizes the licensee to:

(1) practice barbering; and

(2) supervise an apprentice barber.

(b) Subject to § 4–605 of this title, while a barber license is in effect, it authorizes the licensee to practice barbering.

(c) Subject to § 4–605 of this title, while a barber–stylist limited license is in effect, it authorizes the licensee to provide barber–stylist services.