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PCE
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DIFF Subgroup
E21B 1/20

formed as centrifugal hammers

Introduced: January 2000

Full Title

Full titles differ between systems:

IPC:

Percussion drilling > with a reciprocating impulse member > driven by a rotating mechanism > formed as centrifugal hammers

CPC:

Percussion drilling > with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence) > driven by a rotating mechanism > formed as centrifugal hammers

No child classifications to compare. This is a leaf node in both IPC and CPC.