Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6717305 | Apparatus having an electroacoustic transducer forming a sound reproducing means and a part of vibration generating means | Ernst Ruberl, Juha Backman | 2004-04-06 |
| 6681024 | Device including a built-in electroacoustic transducer for optimum speech reproduction | Erich Klein | 2004-01-20 |