Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803458 | Control switch and potentiometer for hearing aids and the like | John A. Trine, Daryle Petersen | 1989-02-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803458 | Control switch and potentiometer for hearing aids and the like | John A. Trine, Daryle Petersen | 1989-02-07 |