Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835870 | Device for measuring the distances and directions of destinations on road maps | Eva Osterkamp, Norbert Stepper | 1989-06-06 |
| 4818141 | Prefabricated erosion prevention wall | — | 1989-04-04 |
| 4814989 | Navigation method for vehicles | Klaus Dobereiner, Ulrich Kanzler | 1989-03-21 |