Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862439 | Recording device that identifies recordable areas of a disk record | Ryo Ando, Tadao Yoshida, Toshio Yoshida | 1989-08-29 |
| 4858217 | Optical disk recording and reproducing device | Tadao Yoshida, Ryo Ando | 1989-08-15 |