| http://www.w3.org/ns/prov#value | - To form the metallic foil layer 57, a metallic foil, e.g., an aluminum foil, which is formed by extending metal such as aluminum to become thin until the thickness is 5-20 ??m is used, or a gold foil, a silver foil, a copper foil, a nickel foil, a chromium foil, a titanium foil, or a foil comprising an alloy of the above kinds of metal can be used.
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