DIFF Subgroup
E21B 1/22 driven by electromagnets
Introduced: January 2000
Full Title
Full titles differ between systems:
IPC:
Percussion drilling > with a reciprocating impulse member > driven by electromagnets
CPC:
Percussion drilling > with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence) > driven by electromagnets
No child classifications to compare. This is a leaf node in both IPC and CPC.