| 摘要 |
A drill bit for drilling into earth formations comprising a plurality of cutting cones and a connecting device to attach a drill bit to a drill string for drilling bore holes and providing a stabilizer for the drill bit in a drill hole and providing a plurality of passage structures to provide and distribute compressed air through the drill string to the drill bit plenum chamber in proportions needed to properly purge cuttings from the bore hole most effectively and maintain stabilization for the drill bit in the drill hole thus providing for longer life expectancy of the drill bit and cutting cones.
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