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| Number | Title | Issue Date |
| 5228522 | Lift assist and cushion spring tool bar wheel for agricultural implements A agricultural implement incorporates a frame which is adapted to engage a three point hitch of a tractor. The frame employs a longitudinally extending member which is pivotally connected to a link member. A resilient yielding assembly is disposed between... | 07/20/1993 |
| 4333534 | Agricultural tool carrier Individual tool bars are mounted between upright guides of a horizontal rectangular frame. Rollers engaging the guides transmit longitudinal forces from the frame to the tool bars and allow the tool bars to move freely up and down. Ground working tools mo... | 06/08/1982 |
