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Terms for subject Drilling containing 内 旋 转 | all forms
ChineseEnglish
内外筒各自旋转的双筒取心筒core barrel of double tube swivel type
内筒不随外筒旋转的双筒取心筒double-tube core barrel, swivel type
内筒随外筒旋转的双筒取心筒double-tube core barrel, rigid type

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