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PCE
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DIFF Subgroup
E21B 4/10

continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers > continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts

CPC:

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers (boring rams E21B11/02) > continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts

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