Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874913 | Luminous element holding structure for an illuminated key switch | Sadao Tachibana | 1989-10-17 |
| 4851618 | Keyboard | Fumihiro Amino, Zenzou Tozuka, Sadao Tachibana | 1989-07-25 |