4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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Thrust face lubrication system for a rolling cutter drill bit

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

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Thrust flange 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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Two-piece pressure relief valve

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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