Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4766815 | Up-grade speed control system of railway marshalling yard | Xu Zhengli | 1988-08-30 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4766815 | Up-grade speed control system of railway marshalling yard | Xu Zhengli | 1988-08-30 |