Two batches of signs below with very different uses. The PLEASE SWITCH OFF LIGHTS WHEN LEAVING ones were for a local factory who used them as part of an energy-saving plan by fitting one at each exit. The bottom batch
Two batches of signs below with very different uses. The PLEASE SWITCH OFF LIGHTS WHEN LEAVING ones were for a local factory who used them as part of an energy-saving plan by fitting one at each exit. The bottom batch