CPC Subgroup
E21B 10/22 characterised by bearing, lubrication or sealing details
Full Title
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Roller bits (E21B10/26 takes precedence; roller core bits E21B10/06; characterised by wear resisting parts E21B10/50) > characterised by bearing, lubrication or sealing details
3 direct subcodes
Child Classifications
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- E21B 10/23 with drilling fluid supply to the bearings
- E21B 10/24 characterised by lubricating details (E21B10/23 takes precedence)
- E21B 10/25 characterised by sealing details