Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848124 | Making seamless pipes, over 200 mm in diameter | Horst Biller, Manfred Bellmann, Rolf Kuemmerling | 1989-07-18 |
| 4803861 | Guide structure for pierced hollows | Rolf Kuemmerling, Manfred Mueller, Klaus-Peter Schirmag | 1989-02-14 |