Issued Patents 2005
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6931140 | Electro-acoustic transducer with two diaphragms | Aart Zeger van Halteren | 2005-08-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6931140 | Electro-acoustic transducer with two diaphragms | Aart Zeger van Halteren | 2005-08-16 |