4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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High speed rock bit

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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Hydrodynamic pump passages for rolling cone drill bit

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

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Hydrostatic thrust face lubrication system

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

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