Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799138 | Circuit for producing an alternating voltage | Martin Brahms, Olaf Wittur | 1989-01-17 |
| 4797874 | Circuit arrangement for the transmission of communication signals | Christian Prenner | 1989-01-10 |