US Patent 7770314 Outdoor advertising system

An outdoor advertising system to support and selectively display an inside panel assembly or an outside panel assembly comprising a substantially rectangular outer frame having a plurality of interior support members attached thereto, a plurality of stringer coupling assemblies to couple a plurality of stringer members to the plurality of interior support members and a plurality of adjustable attachment panel assemblies to attach the inside panel assembly and the outside panel assembly to the substantially rectangular outer frame.