It is unlawful for any person to keep or maintain, or to permit to be kept or maintained, in any place or premises owned or controlled by such person in the city any table which is used or offered for use by the public for the playing of cards for or from which any revenue or charge is derived by such person, without first obtaining a permit and paying a fee for each such table. It shall be presumed that all tables situated in any establishment or place where any table is used or offered for use by the public for the playing of cards, are being so used or offered. The burden of proving that any table located in any such establishment or premises has not been and is not so used or offered shall be upon the person owning or controlling such establishment or premises. (Ord. 32 NCS §1; prior code §8.6.)