Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840171 | Oxygen supply unit having an oxygen generator | Holmer Rohling, Siegfried Preininger | 1989-06-20 |
| 4836197 | Folded protective hood having an oxygen mask | Holmer Rohling, Wolfgang Marqardt | 1989-06-06 |