Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5655955 | Method and tool for improving the structure of the inner faces of working chambers of machines and motors | Wolf Nagel | 1997-08-12 |
| 5647728 | Liquid ring machine having pivoted outer housing | Robert Siebenwurst, Bernhard Tews | 1997-07-15 |