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PCE
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CPC Subgroup
E21B 10/20

characterised by detachable or adjustable parts, e.g. legs or axles

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 detachable or adjustable parts, e.g. legs or axles