Showing 1–7 of 7 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Naotaka Tanaka | Hitachi | 3 |
| 2 | Akira Nomoto | Hitachi Cable | 1 |
| 2 | Kouichi Shibata | Hitachi Construction Machinery Co. | 1 |
| 2 | Kazuo Fujishima | Hitachi Construction Machinery Co. | 1 |
| 2 | Shinji Nishikawa | Hitachi Construction Machinery Co. | 1 |
| 2 | Tadakatsu Nakajima | Hitachi | 1 |
| 2 | Toshiaki Okanishi | Kanzaki Kokyukoki Mfg. Co. | 1 |