Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4225859 | Method and apparatus for monitoring sound-conducting media | Alois Zetting | 1980-09-30 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4225859 | Method and apparatus for monitoring sound-conducting media | Alois Zetting | 1980-09-30 |