Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831656 | Conference microphone for use with hearing impaired amplification system | Robert R. Southern | 1989-05-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831656 | Conference microphone for use with hearing impaired amplification system | Robert R. Southern | 1989-05-16 |