| http://www.w3.org/ns/prov#value | - When a sweep voltage is applied to the surface from the core metal 506 a of the sweep roller 343, the electrical resistivity of the sweep roller 343 is desirably 109 ohms or below and the sweep roller 343 is desirably formed of a synthetic rubber base binder in which conductive particles such as carbon black are dispersed and with a conductive film layer.
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