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A system of boring, using usually hollow rods, with or without the
production of rock cores. Rock penetration is achieved by the rotation of
the cutting tool. The method is used extensively in exploration,
particularly when cores are required. It is the usual method in oil well
boring with holes from 6 to 18 in (15 to 45 cm) in diameter.
See also: boring;
diamond drilling; rotary drill. Nelson
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