| http://www.w3.org/ns/prov#value | - provided at least on the same side as said electrostatic attraction body with respect to the support body, for covering exposed surfaces of the support body except a surface over which the electrostatic attraction body is positioned so that impure materials are prevented from being generated therefrom, said cover means being formed of a cover plate with an aperture in which the work is placed. 2.
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