Showing 1–7 of 7 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Mitsuyoshi Machida | Toto | 14 |
| 2 | Makoto Chikuni | Toto | 12 |
| 3 | Keiichiro Norimoto | Toto | 11 |
| #4 | Yukihiro Muroya | Toto | 6 |
| #5 | Yoshiki Hiruta | Toto | 4 |
| #6 | Takeshi Teraue | — | 3 |
| #6 | Koji Tsuchihashi | — | 3 |
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