Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
Inventor
active
Biased lubricant compensator for an earth boring drill bit
Drill bit with covered ring nozzle retainer
Earth boring bit and lubricator compensation therefor
Earth boring bit and lubricator/compensator therefor
Lubricant pressure relief valve for earth penetrating tools
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