Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823908 | Directional loudspeaker system | Tsuneo Tanaka, Mikio Iwasa, Akira Nakamura | 1989-04-25 |
YK
Youichi Kimura
Overall (1989): #40,950 of 140,708Top 30%
1
Patents 1989