Composite Geological Drill Bit with Anti-Sand Blocking Features
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Diamond Composite Drill Bit with Bend-Resistant Concave-Convex Lip
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New Cleaning Device for Geological Drill Bit Production
Li Xiaohuan Li Zhongyong Patents and innovation Zou Chao
Eco-Friendly Repair Device for Diamond Drill Bits
Li Xiaohuan Li Zhongyong Patents and innovation Zou Chao