Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828590 | Filter arrangement | Karl-Heinz Schirk | 1989-05-09 |
| 4821711 | Protective breathing device | Wolfgang Drews | 1989-04-18 |
| 4822572 | Chemical oxygen generator | Carl-Ernst van der Smissen, Rainer Ernst | 1989-04-18 |
| 4805608 | Breathing apparatus | Gunther Kolbe | 1989-02-21 |