Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5142657 | Apparatus for drilling pronunciation | Sadaaki Ezawa, Katsuhiro Hashimoto, Michiko Nihei | 1992-08-25 |
| 4969194 | Apparatus for drilling pronunciation | Sadaaki Ezawa, Hiroaki Takano | 1990-11-06 |