Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832254 | Process for the manufacture of an injection mould | Gerd Riedel, Lothar Steinsdorfer | 1989-05-23 |
| 4801068 | Method of producing an injection moulding tool | Peter Graczoll, Franz Gumplinger, Gerd Riedel | 1989-01-31 |