Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5650236 | Magnetic marker | Katsuhiro Kawashima, Isamu Ogasawara | 1997-07-22 |
| 5605768 | Magnetic marker and manufacturing method therefor | Shinji Furukawa, Kazuki OKA, Nobuyoshi Yano, Isamu Ogasawara | 1997-02-25 |