| http://www.w3.org/ns/prov#value | - ents at the opposing areas 36a and 4| of the marginal portions 35 and 39 are secured together at the ends of the sealing closure by means of a suitable adhesive material, and a covering strip 48 of woven fabric coated or impregnated with rubber or other rubber-like material is superimposed at the interior face of the wall upon the closing elements in the manner shown especially in Figs. 6 and 8, a
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