Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D480359 | Engine generator | Masao Yamada | 2003-10-07 |
| 6491133 | Soundproof type engine driven work machine | Masao Yamada | 2002-12-10 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D480359 | Engine generator | Masao Yamada | 2003-10-07 |
| 6491133 | Soundproof type engine driven work machine | Masao Yamada | 2002-12-10 |