Patents per Year
Top Inventors at Hirai Engineering All Time
Showing 1–3 of 3 inventors
| Rank | Name | Patents |
|---|---|---|
| 1 | Takashi Hirai | 5 |
| 2 | Keisuke Hirai | 3 |
| 3 | Yoshio Kaneko | 2 |
Showing 1–3 of 3 inventors
| Rank | Name | Patents |
|---|---|---|
| 1 | Takashi Hirai | 5 |
| 2 | Keisuke Hirai | 3 |
| 3 | Yoshio Kaneko | 2 |