Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837835 | Speaker system for motor vehicles with an alarm device | — | 1989-06-06 |
| 4821331 | Coaxial speaker unit | Mitsuyoshi Matsuda | 1989-04-11 |
FM
Fumio Murayama
Overall (1989): #27,631 of 140,708Top 20%
2
Patents 1989