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n5google.com.
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provhttp://www.w3.org/ns/prov#
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isa:4249054
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Barrier means 22 may be made of a hydrophobic material such as polyethylene or other type polyolefins, styrofoam aerated, light-weight multicellular polystyrene plastic, or any other plastic material which has hydrophobic characteristics, or may be a wettable material which is coated with a hydrophobic coating such as paraffin wax, beeswax or various plastics.
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