Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886944 | Pressure or draw bar of fiber-reinforced insulating material | Hans-Gunther Christopher, Joachim Thurk, Thomas J. Schultz | 1989-12-12 |
| 4831220 | High-voltage compressed-gas circuit breaker | Bernd Bruchmann, Michael Punger | 1989-05-16 |
| 4827373 | High-voltage compressed-gas circuit breaker | Heiner Marin | 1989-05-02 |
| 4823232 | High-voltage compressed-gas circuit breaker | Heiner Marin | 1989-04-18 |