Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874133 | Gas supply and distribution center | Hans-Gerd Gethke, Friedel Engelhard | 1989-10-17 |
| 4786297 | Gas supply and distribution system | Hans-Gerd Gethke, Friedel Engelhard | 1988-11-22 |