Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868878 | Sound field correction system | Yoshiro Kunugi, Akio Tokumo, Toshikazu Yoshimi, Yoshio Sasaki, Shuuichi Mori +2 more | 1989-09-19 |
| 4864246 | Mobile automatic volume control apparatus | Masayuki Kato, Fumio Tamura | 1989-09-05 |