Md. Code, Com. Law § 11-601

(a) In this subtitle the following words have the meanings indicated. (b) “Container” means a liquefied petroleum gas container. (c) “Liquefied petroleum gas” means any material which is composed predominately of any of the following hydrocarbons or mixtures of them: (1) Propane; (2) Propylene; (3) Normal butane; (4) Isobutane; or (5) Butylenes. (d) “Mark” includes any name, initial, or other device. (e) “Marked container” means a container which bears on its surface in plainly legible characters the mark of its owner. (f) “Owner” means: (1) Any person who holds a written bill of sale under which title or ownership to a container was transferred to him; or (2) Any manufacturer of a container who has not transferred ownership of the container under a written bill of sale. (g) “Person” includes an individual, corporation, business trust, statutory trust, estate, trust, partnership, association, two or more persons having a joint or common interest, or any other legal or commercial entity.