| http://www.w3.org/ns/prov#value | - Conventionally, as the electrically conductive material forming the electrically conductive layer, use is made of an electrically conductive rubber material containing a rubber material such as a silicone rubber, an acrylonitrile-butadiene rubber, a urethane rubber or a silicone-modified ethylene-propylene rubber, as a base, added to which is an electrically conductive material, such as carbon bla
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