Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858214 | Tracking control apparatus | — | 1989-08-15 |
| 4841407 | Magnetic field generator having a plurality of coils for generating magnetic field in substantially the same space and method of driving the same | Naoki Imokawa, Makoto Shiho | 1989-06-20 |