- telescopic derrick
- 伸缩: stretch out and draw back; e ...
- 式: type; style
- 钻架: drilling cramp; auger board; ...
- 伸缩式钻塔: telescope mast; telescopic derrick; telescoping derrick
- 伸缩式钻头: collapsible bit; expa ive bit; expansion bit; expansive bit; paddy bit
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