Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6931140 | Electro-acoustic transducer with two diaphragms | Leif Johannsen | 2005-08-16 |
| 6914992 | System consisting of a microphone and a preamplifier | Claus Erdmann Fürst | 2005-07-05 |