No operator or proprietor or any person in charge shall allow any minor under seventeen years of age to play or use any such amusement device during the academic year for the Berkeley Unified School District, between the hours of seven a.m. and three p.m., except during school holidays, Saturdays and Sundays; nor between the hours of ten p.m. and seven a.m. preceding school days. Each machine shall be posted with a conspicuous sign indicating such restrictions by the operator or proprietor. (Ord. 5495-NS § 1 (part), 1982)