An approach is provided to provide privacy control in a social network. seed designated 51-518 RZ, which exhibits a combination of traits including early bolting, a semi-erect plant habit, smooth mature leaves, field resistance against leaf spot diseases and resistance to downy mildew races Pfs 1 to 12 and Pfs 14. To the crosshead are connected a pair of shafts, each extending in directions opposing to each other. The cleaning device, since the dust collection member is installed, cleans the sawtooth discharge electrode, simultaneously collects dust such as discharge products and toner on the shield plate by the dust collection member, and can collect dust in the dust collecting portions installed at both ends of the holding plate.