| |||
| 丝扣保护环; 螺纹保护环 | |||
| 护丝; 护丝管箍; 护丝帽 | |||
| 丝扣保护套 | |||
| 螺纹护环 | |||
|
thread protector : 14 phrases in 4 subjects |
| Drilling | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 6 |
| Technology | 3 |
| |||
| 丝扣保护环; 螺纹保护环 | |||
| 护丝; 护丝管箍; 护丝帽 | |||
| 丝扣保护套 | |||
| 螺纹护环 | |||
|
thread protector : 14 phrases in 4 subjects |
| Drilling | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 6 |
| Technology | 3 |