with non-expansible roller cutters

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Drill bits > Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers > with non-expansible roller cutters

CPC:

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 non-expansible roller cutters

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1980.

Child Classifications

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E21B 10/30 Longitudinal axis roller reamers, e.g. reamer stabilisers since 1980 IPC+CPC Available in IPC and CPC