Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861524 | Apparatus for producing a gas mixture by the saturation method | Gunter Sielaff, Norbert Harder | 1989-08-29 |
| 4805675 | Valves for chemical containers | Helmuth Krauss, Peter Muller, Klaus Kreher | 1989-02-21 |