Top Inventors at Washi Kosan Co. All Time
Showing 1–11 of 11 inventors
| Rank | Name | Patents |
|---|---|---|
| 1 | Kenji Sumida | 5 |
| 1 | Kotaro Ono | 5 |
| 3 | Katsunori Yoshimura | 3 |
| #4 | Kazunori Kagei | 2 |
| #5 | Fumihiko Matsuda | 1 |
| #5 | Katsuyo Watanabe | 1 |
| #5 | Masahiko Ono | 1 |
| #5 | Minoru Ono | 1 |
| #5 | Noriaki YAMANAKA | 1 |
| #5 | Toshitaka Nakaya | 1 |
| #5 | Yoshishige Endo | 1 |