characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe

Full Title

Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe

Child Classifications

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• E21B 10/66 the cutting element movable through the drilling pipe and laterally shiftable