Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814928 | Information recording disk provided with distinguishing mark | Hisashi Ito | 1989-03-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814928 | Information recording disk provided with distinguishing mark | Hisashi Ito | 1989-03-21 |