CPC Subgroup
E21B 10/32 with expansible cutting tools
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) > with expansible cutting tools
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- E21B 10/34 of roller-cutter type