DIFF Subgroup
E21B 1/24 the impulse member being a piston driven directly by fluid pressure
Introduced: January 2000
Full Title
Full titles differ between systems:
IPC:
Percussion drilling > with a reciprocating impulse member > the impulse member being a piston driven directly by fluid pressure
CPC:
Percussion drilling > with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence) > the impulse member being a piston driven directly by fluid pressure
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 2000.
Child Classifications
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