| http://www.w3.org/ns/prov#value | - Additionally, there is a need for such an improved plastic sheet piling which will be balanced about its centroid such that the flow of the plastic material through an extrusion die is balanced, and so that the cooling of the extruded sheet piling will also be balanced about the centroid such that torsional forces which would otherwise tend to twist or flex the sheet piling extrusion as it cools w
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