Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5649427 | White smoke generating apparatus and method of using the same | Hiroyuki Sawada, Hisayuki Usui, Masahiro Hirano, Masahiro Yonekura | 1997-07-22 |
| 5592559 | Speaker driving circuit | Toru Hayase | 1997-01-07 |