No minor child under 21 years of age, within the city, shall be permitted, unless accompanied by parent or legal guardian, to remain in any saloon, bar room, or other place where any spiritous or intoxicating liquor, wine, beer, or any beverage containing any spiritous or intoxicating liquor, beer, or malt liquor, is sold, given away, or furnished, or in any place of amusement known as dance houses or halls, concert saloons, or variety theaters. All such establishments shall be posted with signs bearing the legend, “Minors under 21 unaccompanied by parent or guardian prohibited.” No minor shall be present at any time or under any circumstances in any house of prostitution, or in any room or hall occupied or used for hire, gain, or reward for the purpose of cards, dice, or gaming, pool selling or betting in any manner whatever. No proprietor, keeper, or manager of such place shall permit a minor to remain in such place.
(‘83 Code, § 135.02) Penalty, see § 135.99