Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881426 | Dual-type damper device | Minoru Serizawa | 1989-11-21 |
| 4815332 | Dual-type damper device | Minoru Serizawa | 1989-03-28 |
| 4794816 | Dual-type damper device | Minoru Serizawa | 1989-01-03 |