“Patrolman” shall mean an individual engaged in the act of guarding property as the owner or member of a patrol system, or as an employee of either a patrol system or any other system, which purports to furnish or does furnish to members or subscribers any watchman or guard, either uniformed or otherwise, to patrol any territory within the corporate limits of the city or to guard or watch any property, including guarding against theft or fire, or both. “Patrolman” shall not include a person who guards the property of a single owner while such property is not open to the public and the entire salary of such person is paid by the owner and there exists only an employer-employee relationship, or a person who, as an employee, only incidentally guards such property but whose main or principal duty is not that of guarding or protecting property. (Ord. 505 § 3. 2002 Code § 6-14.6).