Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4438892 | Tape cassette, especially a magnetic tape cassette | Horst Fitterer, Bert Nestler | 1984-03-27 |
| 4366903 | Magazine for magnetic tape cassettes | Dieter Gaiser, Kurt Schmidts, Volker Scherer | 1983-01-04 |