| http://www.w3.org/ns/prov#value | - As the outer sleeve member (11) is used a soft resinous sheet, for example, of polycarbonate, nylon, fluorine resin or the like, a sheet of such resin including carbon or metallic fine particles or the like, a metallic thin film of nickel, stainless steel, aluminum or the like, or a laminated sheet of the resinous sheet and the metallic layer.
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