Top Inventors at Showa Tool Co. All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Eiichi Katayama | 2 |
| 2 | Kazuo Rokkaku | 2 |
| 3 | Kouichi Ueda | 2 |
| #4 | Hiroaki Takebayashi | 1 |
| #5 | Shogo Kitamura | 1 |
| #6 | Shinji Yasuhara | 1 |
| #7 | Toshiaki Oku | 1 |
| #8 | Yasushi Fukuta | 1 |
| #9 | Yoshihisa Hiroumi | 1 |
| #10 | Yoshiaki Kakino | 1 |
| #11 | Takayasu Hiroumi | 1 |