| 摘要 |
An abrading group comprises a plurality of abrading units rotationally mounted on a crossbar extending along a transverse direction that is transverse with respect to an intended advance direction of pieces to be abraded, a driving arrangement for rotating each abrading unit around a longitudinal axis thereof, a further driving arrangement for oscillating said crossbar along said transverse direction, said further driving arrangement is such as to oscillate said crossbar also along said advance direction.
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