DIFF Subgroup
E21B 10/36 Percussion drill bits ( characterised by wear resisting parts E21B10/46)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Percussion drill bits
CPC: Percussion drill bits ( characterised by wear resisting parts E21B10/46)
Full Title
Full titles differ between systems:
IPC:
Drill bits > Percussion drill bits
CPC:
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Percussion drill bits ( characterised by wear resisting parts E21B10/46)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- E21B 10/38 characterised by conduits or nozzles for drilling fluids since 1980 IPC+CPC Available in IPC and CPC