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| valve position meter | |||
| valve phase indicator | |||
| valve position indicator | |||
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阀位 指示器 : 9 phrases in 6 subjects |
| Drilling | 1 |
| Electronics | 1 |
| Oil / petroleum | 3 |
| Oil processing plants | 2 |
| Space | 1 |
| Technology | 1 |
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