... drill cuttings 岩屑 drill edge 钻头切削刃 drill extractor 钻井打捞器 ...
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taper shank three-edge hole-dilating drill 锥柄三刃扩孔钻
drill l edge 钻头切削刃
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In a recent practice, Mr. Martin worked with Mr. Bertani on what is known as an edge drill.
WSJ: What's Your Workout? A Skater's Edge
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