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See Chinese contents: JB/T 9023.2-1999 JB/T 9023.2-1999: KQJ series downhole drill
This standard specifies the type, basic parameters, technical requirements, safety requirements, test methods, inspection rules, marking, packaging, transportation and storage of KQJ downhole drills. This standard applies to non-self-propelled downhole drills (hereinafter referred to as drills).
