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PCE
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DIFF Subgroup
E21B 4/08

impact being obtained by gravity only, e.g. with lost-motion connection

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 > impact being obtained by gravity only, e.g. with lost-motion connection

CPC:

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers (boring rams E21B11/02) > impact being obtained by gravity only, e.g. with lost-motion connection

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