Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868876 | Electrostatic discharge protection device | Johann Luger, Hans Schierl, Heinrich Kallhardt | 1989-09-19 |
| 4845760 | Electro-acoustic transducer arranged within the handset of a telephone instrument | Erwin Awakowicz | 1989-07-04 |
| 4839921 | Telephone station comprising an optical display device | Erwin Awakowicz, Erwin Grassl | 1989-06-13 |