This technology can do repetition measurement of well bore track, determine drilling direction and window cutting direction of sidetrack well and so on.

该技术可用于井身轨迹复测、钻井定向和侧钻井开窗定向等。

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After being pushed, Mr. Han attempted to lift himself out of the track bed as the train bore down on him, but was unsuccessful, police said.

WSJ: New York Subway Push Suspect Is Questioned