Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864530 | Display system for a compact electronic apparatus | Akira Natsuhara | 1989-09-05 |
| 4796215 | Programmable calculator with external memory module and protection against erroneous erasure of data in the module | — | 1989-01-03 |