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Drill bits with leading portion, i.e. drill bits with a pilot cutter Drill bits for enlarging the borehole
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Industry
CPC
E21B10/26
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21B
EARTH DRILLING
E21B10/00
Drill bits
Current Industry
E21B10/26
Drill bits with leading portion, i.e. drill bits with a pilot cutter Drill bits for enlarging the borehole
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