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Drilling Rock and Earth
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http://en.wikipedia.org/wiki/Reuleaux_trianglehttp://en.wikipedia.org/wiki/Reuleaux_trianglehttp://en.wikipedia.org/wiki/Reuleaux_trianglehttp://en.wikipedia.org/wiki/Reuleaux_trianglehttp://en.wikipedia.org/wiki/Reuleaux_trianglehttp://en.wikipedia.org/wiki/Torquehttp://en.wikipedia.org/wiki/Drill -
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Rotary-Percussion Drill
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Downhole Drills
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Diamond drills
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