Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4586195 | Microphone range finder | Hartwig Ruell, John Welch | 1986-04-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4586195 | Microphone range finder | Hartwig Ruell, John Welch | 1986-04-29 |