Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4890330 | Hearing aid with interchangeable battery compartment and audio connection | — | 1989-12-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4890330 | Hearing aid with interchangeable battery compartment and audio connection | — | 1989-12-26 |