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PCE
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CPC Subgroup
E21B 10/54

the bit being of the rotary drag type, e.g. fork-type bits

Full Title

Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > characterised by wear resisting parts, e.g. diamond inserts > the bit being of the rotary drag type, e.g. fork-type bits

1 direct subcode

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