Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852177 | High fidelity earphone and hearing aid | — | 1989-07-25 |
| 4797518 | Braking indicator | Jeffrey W. Tunkel, Joseph F. Shelley | 1989-01-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852177 | High fidelity earphone and hearing aid | — | 1989-07-25 |
| 4797518 | Braking indicator | Jeffrey W. Tunkel, Joseph F. Shelley | 1989-01-10 |