Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5657232 | Onboard positioning system | Seiji Ishikawa, Tomio Yasuda, Toshimitsu Oka | 1997-08-12 |
| 5631838 | Apparatus for verifying GPS satellite data | Seiji Ishikawa, Tomio Yasuda, Tomohiro Yamamoto, Toshimitsu Oka | 1997-05-20 |