Ụgwọ nke ụlọ ọrụ Zhuzhou Drillmore Rock Tools Co., Ltd.
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PDC Bit na Dọrọ Bit
Dum Tricone Bit maka Ngwuputa Tricone Bit maka igwu mmiri nke ọma DTH Hammer na DTH bit Ngwa Hammer kacha elu Welie Cutter na-agwụ ike HDD oghere oghere Core Barrel Roller Bit PDC Bit na Dọrọ Bit
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