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DIFF Subgroup
E21B 21/18

Preventing exhaust air from the drill motor from blowing-off towards the working face

Introduced: January 2000

Full Title

Full titles differ between systems:

IPC:

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor > Preventing exhaust air from the drill motor from blowing-off towards the working face

CPC:

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) > Preventing exhaust air from the drill motor from blowing-off towards the working face

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