Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4756538 | Device for clamping drill pipe and the like in mouse hole pipe | Jin Weiguo | 1988-07-12 |
| 4727781 | Supercharged power tongs | Gao Kun | 1988-03-01 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4756538 | Device for clamping drill pipe and the like in mouse hole pipe | Jin Weiguo | 1988-07-12 |
| 4727781 | Supercharged power tongs | Gao Kun | 1988-03-01 |