Subject to § 4–605 of this title, while a master barber license is in effect, it authorizes the licensee to: practice barbering; and supervise an apprentice barber. Subject to § 4–605 of this title, while a barber license is in effect, it authorizes the licensee to practice barbering. 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.