When a person shall sell or offer to sell any foods, wares, merchandise, service, or other thing of value in the city; or when he shall, by use of signs, circulars, cards, telephone book, newspaper, radio or television, advertise, hold out or represent that he is commencing, engaging in, conducting, operating, managing, carrying on, or soliciting any business in the city; or when any person holds an active license or permit issued by a governmental agency indicating he is in business in the city and such person fails to deny by a sworn statement that he is conducting a business in the city, after having been requested to do so by the collector; then these facts shall be considered prima facie evidence that he is conducting or engaging in business in the city. (Ord. 470 § 2 (part), 1991: prior code § 12-6)