DIFF Subgroup
E21B 25/10 Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Formed core retaining or severing means
CPC: Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence)
Full Title
Full titles differ between systems:
IPC:
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors > Formed core retaining or severing means
CPC:
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) > Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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