| http://www.w3.org/ns/prov#value | - Outer laminates 20 and 21 are substantially identical in construction and each comprises a foil 27 of a conductor such as aluminum, a thin plastic covering 28 such as the polyester compound Mylar secured to the outer surface of foil 27 and a thin sheet 29 of a plastic compound such as polyethylene adhered to the opposite surface of foil 27.
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