Maryland Code, Business Regulation § 3-402

(1) annually, each amusement attraction at an amusement park;

(2) annually, each inflatable amusement attraction in which, while in contact with the attraction, an individual is 4 feet or more above the ground;

(3) except for an inflatable amusement attraction, each amusement attraction, if moved, before it begins operation at another location; and

(4) each new or modified amusement attraction before it begins public operation.

(b)(1) An amusement owner shall notify the Commissioner before operating an amusement attraction that is new, modified, or reconstructed.

(2) An owner or lessee of a carnival or fair shall:

(1) after inspection the Commissioner finds that the amusement attraction complies with this title and the regulations adopted under it; and

(2) the amusement owner submits to the Commissioner a certificate of insurance for the amusement attraction as required by § 3-403 of this subtitle.

(d)(1) A certificate of inspection for an amusement attraction at an amusement park expires not more than 1 year after the date of issuance.

(2) A certificate of inspection for an amusement attraction at a fair or carnival expires not more than 30 days after the date of issuance.

(3) A certificate of inspection for an inflatable amusement attraction in which, while in contact with the attraction, an individual is 4 feet or more above the ground expires not more than 1 year after the date of issuance.