| http://www.w3.org/ns/prov#value | - Patent US3836425 - Thin, flexible barrier material - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA fabric- and fiber-free, heat-sealable structure useful as a barrier material limiting passage through itself of solids, liquids, semisolids, gases or forms of energy such as ultraviolet light, said structure comprising a first ply of a rel
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