| http://www.w3.org/ns/prov#value | - As shown in more detail in FIG. 2, the frame 12 is preferably constructed from one or more layers 24 of a relatively inexpensive insulating material such as cardboard or foamed plastic to provide a self-supporting structure that is relatively light in weight, but nevertheless sufficiently rigid that it will not collapse as a result of gravity or tensile forces from conductive mesh fabric.
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