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Bq, Nq, Hq, Pq PDC Core Drilling Bit
2025-04-13
introduction 4390
BQ, NQ, HQ, PQ
Customized
ISO9001
Core Drill Bit
Matric PDC
Well Drilling, Metal Drilling
Crown
CROWN
Carton Box
Wireline Series, Metric standard, DCDMA, CDDA
China
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