| http://www.w3.org/ns/prov#value | - The first member 12 may be transparent or opaque and may be made from any suitable material including synthetic, film-forming polymeric materials such as, for example, polyvinylacetate, polyvinylchloride, polyvinylchloride-polyvinylalcohol copolymers, polypropylene, polystyrene,cellulose acetate butyrate, hydrolyzed cellulose acetate butyrate, styrene acrylonitrile and the like, metals, ceramics,
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