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Terms for subject Drilling containing верхний клапан | all forms | exact matches only | in specified order only
| Russian | English |
| верхний клапан ведущей трубы | upper kelly valve (реже MichaelBurov) |
| верхний клапан ведущей трубы | upper kelly cock (a valve installed above the kelly that can be closed manually to protect the rotary hose from high pressure that may exist in the drill stem. paderin) |