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device for drilling a hole in the stand for communication with multiple layers aquiferes
device for drilling a hole in the stand for communication with multiple layers aquiferes
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机译:在支架上钻孔以与多层含水层连通的装置
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摘要
the invention relates to a device for fitting a tightly cased holes drilled, with the help of a columns in steps,located in communication with multiple aquifer by means of perforaturi laid out in the
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