No house-car trailer shall be maintained in the city as a permanent office. Such office use as is compatible with the demonstration and sale of such articles or services as may be readily transported in a house-car trailer by a distributor or salesman may be permitted in a house-car trailer on a legally located parking lot within the business or industrial zones of the city for a period of time not exceeding seven days, provided such house-car trailer is not used for living or sleeping purposes during such time.
('69 Code, § 21-7) (Ord. passed 2-24-53) Penalty, see § 115.99