| http://www.w3.org/ns/prov#value | - a clamping member including a frame that defines a frame space, and a screw rod engaging threadedly the frame and extending into the frame space; a movable supporting arm mounted movably on the frame; a fastening member connected to the movable supporting arm and the frame for securing releasably the movable supporting arm to the frame; and a holding member mounted rotatably on the movable support
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