Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
E21B 3/03

with an intermittent unidirectional rotation of the tool

Introduced: January 2000

Full Title

Rotary drilling > Surface drives for rotary drilling > with an intermittent unidirectional rotation of the tool

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