Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4726304 | Seed drill | Heinz Dreyer | 1988-02-23 |
| 4694759 | Seed drill | Heinz Dreyer, Bernd Scheufler, Johannes Luhrmann | 1987-09-22 |
| 4603645 | Seeder with sowing shares | — | 1986-08-05 |
| 4580507 | Drill for applying seed and fertilizer | Heinz Dreyer | 1986-04-08 |
| 4422392 | Seed drill with disk-type furrow openers | Heinz Dreyer | 1983-12-27 |
| 4208974 | Seed drill having parallel guide means for the movable shank | Heinz Dreyer | 1980-06-24 |