4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
  6. Rotation of bit actuates lubricant feed means
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Rock bit internal lubricant pump

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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Rock drill bit lubricant circulating 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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Rotary drill bit

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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Rotary earth boring drill bit with centrifugal lubrication syste

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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