| http://www.w3.org/ns/prov#value | - roof, the roof edging mechanism comprisinga dam means adapted to be secured to a roof and adjacent to a wall, the dam means including an inclined portion having a lower edge engaging the roof and having an upper edge, and a vertical portion connected to the inclined portion and adapted to extend downwardly with at least a portion of said vertical portion being adjacent the wall, said vertical port
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