| http://www.w3.org/ns/prov#value | - The wall(s) may be formed from any suitable material, including metals, such as steel, aluminium, copper, silver, platinum or alloys, glass, such as quartz glass, normal glass or the like, plastic, polymethylmethacrylate (PMMA), Mylar, polypropylene (PP), polyethylene (PE) or their composites, or a combination thereof.
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