| http://www.w3.org/ns/prov#value | - (4) Signs prohibited to be erected or maintained under section 4 of the act (36 P. S. ?? 2718.104), until such time as each sign has been removed; provided, however, that a permit may not be required for signs in commercial or industrial zones, certified by the Secretary to the Secretary of Transportation of the United States under section 5(b) and (d) of the act (36 P. S. ?? 2718.105(b) and (d)),
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