Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865519 | Oil submersible pump | He Benyuan, Cui Yongqiang | 1989-09-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865519 | Oil submersible pump | He Benyuan, Cui Yongqiang | 1989-09-12 |