| http://www.w3.org/ns/prov#value | - 500 cubic feet per minute, and (c) on the side of said inner layer opposite said wear surface an impervious surface comprising a synthetic polymer film having a thickness of about 0.75 to 1.5 mils, said inner layer, wear surface, and film being combined by a pattern of bond areas occupying up to about 10% of the surface area and the combination further including means selected from the group cons
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