Национальный Технический Университет Украины "Киевский Политехнический Институт"
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Runners comprise a frame, a fixed bowl with slits made in the form of vertical plates placed together with a gap relative to each other, which are grouped into four collapsible sections of rectangular or square shape, while the central hollow portion is formed by offset of the sections to each other, on the bowl a circular board is secured and at least two rollers are mounted inside the circular board.