| http://www.w3.org/ns/prov#value | - A roof support assembly for a roof, comprising:(a) roof support pin including an elongate rod having a non-circular cross-section to provide corners, the rod being twisted in one direction so that the corners provide longitudinal substantially helical fins, and (b) a roof support plate held stationary relative to the roof and provided with an aperture in which the rod is received, the aperture hav
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