Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6373686 | Key protection structure for an electronic apparatus | Tadahiko Ogawa, Hajime Takakuwa, Hiroyuki Yamamoto | 2002-04-16 |
| 5218579 | Numerical value setting device | Hiroyuki Yamamoto, Hideaki Tanaka | 1993-06-08 |