the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe

Full Title

Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) > the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe

Child Classifications

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• E21B 25/04 the core receiver having a core forming cutting edge or element, e.g. punch type core barrels