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DIFF Subgroup
E21B 1/04

Devices for reversing the movement of the rod or cable at the surface

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Percussion drilling > Surface drives for drop hammers, e.g. with a cable > Devices for reversing the movement of the rod or cable at the surface

CPC:

Percussion drilling > Surface drives for drop hammers , e.g. with a cable > Devices for reversing the movement of the rod or cable at the surface

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