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Percussion drilling

1 byte added, 19:51, 1 May 2012
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- Unlike any other drilling method , percussion can remove boulders and break harder formations, effectively and quickly through most types of earth. <br>
- Percussion drilling can in principle deal with most ground conditions.<br>
- Can drill hundreds of feet (one well hand-drilled in China in 1923 was over 4000 feet deep). <br>
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