Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4225932 | Instructional calculator | Reiji Hirano, Koichi Mochizuki, Jyoji Shimazu | 1980-09-30 |
| 4217656 | Electronic calculator | Reiji Hirano, Koichi Mochizuki, Jyoji Shimazu | 1980-08-12 |