| http://www.w3.org/ns/prov#value | - The contact charging means made of a metal such as aluminum, iron or copper; a conductive polymer material such as polyacetylene, polypyrrole or polythiophene; a rubber or synthetic fabric conductively treated with a dispersion of conductive particles such as particles of carbon black or a metal in an insulating resin such as polycarbonate or polyethylene; or an insulating resin coated with a cond
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