Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846642 | Rotary piston blower with foamed synthetic material surfaces running along roughened metal surfaces | Werner Schubert, Wolfgang Sohler | 1989-07-11 |
| 4822253 | Machine installation for a heat pumping plant | — | 1989-04-18 |