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DIFF Subgroup
E21B 25/16

for obtaining oriented cores

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors > for obtaining oriented cores

CPC:

Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) > for obtaining oriented cores

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