DIFF Subgroup
E21B 10/06 Roller core bits
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Drill bits > Core bits > Roller core bits
CPC:
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Core bits (characterised by wear resisting parts E21B10/48) > Roller core bits
No child classifications to compare. This is a leaf node in both IPC and CPC.