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| Number | Title | Issue Date |
| 4696349 | Farm implement with frame connected thereto by linkage mechanism An implement-mounting linkage mechanism for pivotally connecting a frame to a wheeled implement is disclosed. The mechanism is preferably used for pivotally connecting a wheeled load-bearing frame to the backside of a wheeled farm implement. The frame inc... | 09/29/1987 |
| 4676321 | Framework for ground working implement A ground working implement is disclosed, having a multiplicity of ground working tools mounted on a set of rigid bars which are maintained in substantially parallel relative position by pairs of rigid links flexibly fastened to the pairs of the rigid bars... | 06/30/1987 |
