Md. Code, Public Safety § 12–811

(a) If an inspection discloses that an elevator unit complies with the Safety Code and other regulations adopted by the Commissioner, the Commissioner shall issue a certificate to the owner or lessee of the elevator unit.

(b) The certificate shall be posted conspicuously in or on the elevator unit.

(c) While a certificate is in effect, it authorizes the holder to operate the elevator unit in a building, structure, or place of employment in the State.