Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818338 | Method for emptying suspension for a pulper | Helmut Thumm, Walter Musselmann | 1989-04-04 |
| 4800687 | Method for cylindrical grinding of rolls | Werner Kade, Georg Zurn, Gunter Rohde | 1989-01-31 |