Nuisances. No store or shop in the district shall use any noise-making devices, such as phonographs, loudspeakers, amplifiers, radios, television sets or similar devices, so situated as to be heard outside any building in the district. A public address system is permitted if operated by the management of the shopping center, provided that the sound is not audible in any residential district. No smoke, fumes or objectionable colors shall be emitted from any building. The display of merchandise on the exterior premises of any building is prohibited. All trash, garbage and debris of every kind shall be stored indoors until such time as they are collected for disposal. No sign shall be illuminated beyond the hours of operation of the use to which it pertains.