Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851936 | Erasing method for erasing information corrected on a magnetic recording medium | — | 1989-07-25 |
| 4821127 | Demagnetizing apparatus for erasing signals recorded on concentric tracks | Hitoshi Hirobe | 1989-04-11 |