Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10066418 | Changeable combined mechanical key | Yongzhi Zhang, Naizhong Chen, Yuan Du | 2018-09-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10066418 | Changeable combined mechanical key | Yongzhi Zhang, Naizhong Chen, Yuan Du | 2018-09-04 |