Jinquan’s outstanding performance in Africa’s drilling, mining, construction, engineering work etc…

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China leading Top-hammer rock drilling tools factory Jinquan has outstanding…

Selection and Design of Threaded Drill Button Bits

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In addition to the choice of tunsten carbide button grade, how…

Rock Stone Classification and Stone Hardness

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The hardness of stone is measured by Mohs hardness as a unit…

Processing technology for threaded drill rods & shank adaptors

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Steel Smelting and Rolling Drill steel smelting quality control,…