Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867659 | Parallel-and external-axial rotary piston blower operating in meshing engagement | Dankwart Eiermann | 1989-09-19 |
| 4846642 | Rotary piston blower with foamed synthetic material surfaces running along roughened metal surfaces | Roland Nuber, Werner Schubert | 1989-07-11 |