4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
  6. With fluid pressure-actuated feed means
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Apparatus and method for downhole lubrication replenishment

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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Automatic depth compensating device

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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Automatic depth compensating system for drill bit lubrication

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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