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| Number | Title | Issue Date |
| 4301872 | Plow with correlated pull bar adjustment and support wheel steering An articulated plow is provided with a laterally swingable pull bar (31) and steerable intermediate support wheels (46, 47) which are controlled by a hydraulic system providing correlated movement through parallel connected hydraulic jacks (37, 66). A lat... | 11/24/1981 |
