CPC Subgroup
E21B 25/10 Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence)
Full Title
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)
2 direct subcodes
Child Classifications
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- E21B 25/12 of the sliding wedge type
- E21B 25/14 mounted on pivot transverse to core axis