| 摘要 |
An apparatus having a frame adapted for earth traversing movement in a direction of travel and having a portion laterally positionable with respect to the direction of travel, a work assembly pivotally mounted on the laterally positionable portion of the frame for movement therewith, and an arm interconnecting the work assembly and the frame to pivot the work assembly through a plurality of positions relative to the direction of travel as the portion of the frame is laterally positioned.
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