4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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Combination seal and pressure relief valve for sealed drill stri

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Patent

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Compact roller cutter

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent

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Compensator for earth boring bits

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent

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Compressible pressure compensator within closed lubricant volume

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Patent

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Cutter actuated rock bit lubrication system

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – Rotation of bit actuates lubricant feed means
Patent

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