Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11186901 | Chisel and steel for chisel | Akihiro Ochiai, Norimasa Tsunekage, Yuko Nagaki | 2021-11-30 |
| 11162152 | Bearing bushing for track, and method for producing the same | Yusuke Kondo, Kazuo Maeda | 2021-11-02 |