Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4718415 | Breathing mask having a transducer movable parts coupled to a speaking diaphragm for speech transmission | Werner Fidi | 1988-01-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4718415 | Breathing mask having a transducer movable parts coupled to a speaking diaphragm for speech transmission | Werner Fidi | 1988-01-12 |