Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827099 | Method and apparatus for continuous production of tubular bodies by means of laser longitudinal seam welding | Rolf Krebs, Otto Welsing, Friedhelm Retzlaff, Friedhelm Gunter, Hans-Jürgen Wahl +1 more | 1989-05-02 |