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| Number | Title | Issue Date |
| 4971154 | Harrow assembly A harrow assembly adapted to be towed by a towing vehicle in either a working mode or a transport mode. The harrow assembly includes front and rear offset disc harrow units pivoted at one end portion. Each offset disc harrow unit includes a transport whee... | 11/20/1990 |
| 4591003 | Offset harrow Forward and rear gang disc harrow carriers are hingedly joined near corresponding ends by a vertical axis hinge structure. Near their other corresponding ends, the gang disc harrow carriers are interconnected through a four element linkage having an opera... | 05/27/1986 |
