soilmec Sr40,sr60,sr625,sr70,sr80 friction kelly bar ,interlock kelly bar

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soilmec Sr40,sr60,sr625,sr70,sr80 friction kelly bar ,interlock kelly bar

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soilmec Sr40,sr60,sr625,sr70,sr80 friction kelly bar ,interlock kelly bar

FRICTION KELLY BAR Friction type drill Kelly bar is a kind of drill pipe type with international advanced six-ribs distribution technology composition. The Kelly bar can generate pressure force when ...

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