Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806843 | D.C. voltage supply circuit | Ferdinand Mertens, Norbert Wittig | 1989-02-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806843 | D.C. voltage supply circuit | Ferdinand Mertens, Norbert Wittig | 1989-02-21 |