Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823908 | Directional loudspeaker system | Tsuneo Tanaka, Youichi Kimura, Akira Nakamura | 1989-04-25 |
MI
Mikio Iwasa
Overall (1989): #76,596 of 140,708Top 55%
1
Patents 1989