Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4656548 | Tape cassette containing echo-erasing means | Dietmar Pfefferkorn, Eberhard Koester, Norbert Kreimes, Bozidar Pavelka | 1987-04-07 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4656548 | Tape cassette containing echo-erasing means | Dietmar Pfefferkorn, Eberhard Koester, Norbert Kreimes, Bozidar Pavelka | 1987-04-07 |