Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886411 | Protective means for a lifting/tilting or tilting device | Karl-Heinz Droge | 1989-12-12 |
| 4824315 | Equipment for emptying containers statement as to rights to inventions made under federally-sponsored research and development | Jakob Naab, Karl-Heinz Droge | 1989-04-25 |