DIFF Subgroup
E21B 10/50 the bit being of roller type
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Drill bits > characterised by wear resisting parts, e.g. diamond inserts > the bit being of roller type
CPC:
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > characterised by wear resisting parts, e.g. diamond inserts > the bit being of roller type
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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