Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821331 | Coaxial speaker unit | Fumio Murayama | 1989-04-11 |
MM
Mitsuyoshi Matsuda
Overall (1989): #76,091 of 140,708Top 55%
1
Patents 1989