... drill feed 钻头进给装置 drill fittings 钻孔配件 drill ga(u)ge 钻径规 ...
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core-drill fittings 取心钻具零件
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Of course, when you drill down there, water comes up, water, sludge and what they call fittings, which are the little pieces of rock and things that come up.
NPR: Drilling for Gas in Dallas-Fort Worth
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