Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843623 | Hearing aid devices in which high frequency signal portions are transposed in low frequency compenstion signal portions | Jean-Claude Lafon | 1989-06-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843623 | Hearing aid devices in which high frequency signal portions are transposed in low frequency compenstion signal portions | Jean-Claude Lafon | 1989-06-27 |