| 摘要 |
A bore pipe is rotatably driven to dirve a horizontal bore below the earth's surface, and radio energy transmitted from a locator device is monitored on the ground surface by means of a radio receiver tuned to the same frequency. A boring bit locator is rigidly attached between the bore pipe and a boring bit, and carries a small battery powered transmitter. A single operator working on the surface of the ground with a single radio receiver is able to monitor the progress and location of the boring bit.
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