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ARRANGEMENT FOR COOLING BOREHOLE IN DRILLING ROCK FROZEN FOR MANY YEARS
ARRANGEMENT FOR COOLING BOREHOLE IN DRILLING ROCK FROZEN FOR MANY YEARS
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机译:多年钻岩冻结中的冷却孔布置
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摘要
device for cooling of a borehole while drilling многолетнемерз past rocks, включаннцее drilling weights, a source of compressed air, a dehumidifier, an umbrella - gay рметизатор,angle vortex cooler wi
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