Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881262 | Electronic hybrid circuit | Jurgen Zanzig | 1989-11-14 |
| 4829562 | Receiver for detecting different fixed frequency signals on a telephone trunkline | Katalin Grafl | 1989-05-09 |