| 摘要 |
This disclosure involves a scraper having freely rotating disc-shaped cutters with their axes of rotation in the plane of a flat, circular common holder; each cutter's axis of rotation being at an angle from radial lines extending from the center of the holder, about which the holder is rotationally driven. The disc-shaped cutters are of thin cross section so that the disc edges easily cut into tough or gummy surfaces as they are driven in circular patterns by the holder.
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