Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5134269 | Grid welding machine operating according to the electrical resistance welding principle | Gerhard Ritter, Klaus Ritter, Rudolf Scherr | 1992-07-28 |
| 4940874 | Convertible single or double spot welding machine | Gerhard Ritter, Klaus Ritter, Rudolf Scherr | 1990-07-10 |