| http://www.w3.org/ns/prov#value | - layers 3 and 8 are composed of, for example, a metal oxide such as ruthenium oxide, acetylene black, graphite, a mixture of silver powder and graphite, or a mixture of nickel powder and graphite, and a binder such as phenol resin. [0047] In the above embodiment, although the four lower-surface side resistive layers 3 are provided, the invention is not limited to this.
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