Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9166781 | Key change management apparatus and key change management method | Masato Shimano, Go Fujino, Yoshiyuki Tsuzuki, Isao Takeyasu, Eiji Tokita | 2015-10-20 |
| 6142577 | Hydraulic muck handling system for tunnel boring machine | Minoru Tayama, Kiyoshi Tsuchiya, Yasuaki Ishikawa, Ryoichi Arita, Kazunori Ueda | 2000-11-07 |