Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864530 | Display system for a compact electronic apparatus | Koichi Hatta | 1989-09-05 |
| 4811257 | Electronic calculator having means for directly inputting variables into a prestored and displayed equation | Toshihiko Sumitani | 1989-03-07 |