| http://www.w3.org/ns/prov#value | - eturn member of such length as to span the distance between said rail and said wall, each of said rail and said return member having at one end thereof a downwardly facing flat mounting surface, the socket for the accommodation of said one end of said rail having a flat surface on which the flat surface of said rail may seat and the socket for the accommodation of said return member having a flat
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