It shall be unlawful for any outdoor advertiser to carry on his business unless the name of such advertiser is attached, displayed, or printed on all billboards or signboards used by him, or on any notice placard or advertisement posted by him, in such lettering as to be visible from a distance of at least five feet from the notice or advertisement.
('70 Code, § 2.2.21.10) Penalty, see § 111.99