Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849709 | Variable frequency characteristic circuit for a vehicular sound device | Hiroshi Hattori | 1989-07-18 |
| 4845775 | Loudspeaker reproduction apparatus in vehicle | — | 1989-07-04 |