It shall be unlawful, after the effective date of the ordinance codified in this Section, to erect or structurally alter any sign, or to maintain any sign which has been erected or structurally altered after said effective date, in the M-1 Light Manufacturing Zone, except as permitted in Article 23 of this Chapter.
(Ord. 1957 8-30-68; Ord. 1520 5-3-60)