CPC Subgroup
E21B 10/26 Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)
Full Title
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)
3 direct subcodes
Child Classifications
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- E21B 10/28 with non-expansible roller cutters
- E21B 10/32 with expansible cutting tools