| 2704015 | Plow point pitch control | |||
| 2691930 | Adjustable earthworking implement | |||
| 2625090 | Two-way plow | |||
| 2617342 | Combination lift and drawbar for tractors | |||
| 2552097 | Two-way plow | |||
| 2464615 | Power lift for implements | |||
| 2324840 | Agricultural implement | |||
| 2228865 | Ground working apparatus | |||
| 2194202 | Ground working implement | |||
| 2138304 | Earthworking implement | |||
| 1969684 | Ripper |
| FR689592A | ||||
| GB278904A | ||||
| GB415253A | ||||
| GB541436A | ||||
| GB703890A | ||||
| IT459670B |