Top Inventors at Yamatoya & Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Iwao Numakura | 15 |
| 2 | Takashi Numakura | 12 |
| 3 | Susumu Kitazawa | 4 |
| #4 | Noriyuki Ebina | 2 |
| #5 | Noriaki Tsukada | 2 |
| #6 | Hirotoshi Yoshimura | 1 |
| #7 | Kazuyoshi Nishio | 1 |
| #8 | Kazunori Tsuge | 1 |
| #9 | Kiyomaru Shoda | 1 |
| #10 | Kiyoshi Tanaka | 1 |
| #11 | Koji Akiyama | 1 |
| #12 | Masaru Murakami | 1 |
| #13 | Takehiro Kato | 1 |
| #14 | Tadayoshi Saito | 1 |
| #15 | Yoshihito Tanaka | 1 |
| #16 | Junichi Naya | 1 |
| #17 | Otome Shoda | 1 |
| #18 | Akira Inoue | 1 |