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12 1/4inch steel tooth drill bit
13 1/2nch steel tooth drill bit
9.5 inch IADC637metal sealed bearing type tricone bit
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17.5 inch 444.4mm IADC537 tricone bit
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12 1/4inch IADC537 insert tricone bit
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10 5/8inch ADC537 insert tricone bit
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250mm 9.5inch IADC 537 tricone drill bit
9.5inch 241mm IADC537 tricone bit with metal sealed bearing
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For customers to solve practical problems, to meet the needs of users, genuine goods as the mission, in 2019, the State Intellectual Property Office issued a number of patent certificates