| 摘要 |
<p>The frame is articulated behind a multi-row beet filter. Two sets of four guides are carried by the frame, connected by a bridge piece at the rear. A shaft carried on top of the bridge piece has a member at each end which sweeps down and then along horizontally inside the guides before rising at the front to be joined together by a bar above the guides. The bottom runs form skids which, in use, rest on the ground. The front of the frame pivots and the skids pivot about the bridge so that structure follows the contour of the ground.</p> |
