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| Number | Title | Issue Date |
| 4781506 | Self-drilling screw A self-drilling screw having a head at one end and a forged drilling end configuration at the other. The drilling end configuration comprises a pair of longitudinally extending flutes which are separated by land portions and which extend through a tapered... | 11/01/1988 |
| 4332127 | Combine feeder drive control A self-propelled combine for harvesting a crop and including a crop threshing and separating mechanism and a feeder for feeding crop material into the threshing and separating mechanism. The feeder has an electro-hydraulic control system for engaging and ... | 06/01/1982 |
