CPC Subgroup
E21B 10/60 characterised by conduits or nozzles for drilling fluids (for roller bits E21B10/18; for percussion drill bits E21B10/38)
Full Title
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > characterised by conduits or nozzles for drilling fluids (for roller bits E21B10/18; for percussion drill bits E21B10/38)
3 direct subcodes
Child Classifications
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- E21B 10/61 characterised by the nozzle structure