Md. Code, Pub. Safety § 12-832

(a) While an elevator mechanic license is in effect, it authorizes the licensee to erect, construct, wire, alter, replace, maintain, repair, dismantle, or service elevator units under the direct supervision of a licensed elevator contractor. (b) While an elevator contractor license is in effect, it authorizes the licensee to engage in the business of erecting, constructing, wiring, altering, replacing, maintaining, repairing, dismantling, or servicing elevator units. (c) While an elevator renovator contractor license is in effect, it authorizes the licensee to engage in the business of performing work: (1) on the interior of an elevator involving the removal or installation of the nonstructural surface of the elevator’s wall, ceiling, floor, rail, or handle; and (2) that does not affect the elevator’s moving operation. (d) While an elevator renovator mechanic license is in effect, it authorizes the licensee to perform work: (1) on the interior of an elevator involving the removal or installation of the nonstructural surface of the elevator’s wall, ceiling, floor, rail, or handle; and (2) that does not affect the elevator’s moving operation. (e) While an accessibility lift mechanic license is in effect, the license authorizes the licensee to erect, construct, wire, alter, replace, maintain, repair, dismantle, and service commercial stairway chairlifts, vertical platform lifts, or incline platform lifts under the direct supervision of a licensed elevator contractor.