Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877974 | Clock generator which generates a non-overlap clock having fixed pulse width and changeable frequency | Shinichi Nakagawa | 1989-10-31 |
| 4869701 | Electrical educational toy | Takeo Shibukawa, Fujiyo Mandai | 1989-09-26 |