Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858485 | Inscribed transmission device | Kunitoshi Kozakae | 1989-08-22 |
| 4833665 | Information recording control system reusing a defective area | Kenji Tokumitsu, Takashi Doi, Michio Miyazaki, Yuji Yamane, Nobuyoshi Izawa | 1989-05-23 |