4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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Plunger lubricant compensator for an earth boring drill 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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Pressure compensator and lubricating reservoir with improved res

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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Pressure compensator for drill bit lubrication system

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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Pressure compensator for rotary earth boring tool

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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Pressure relief system and methods of use and making

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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Pressure relief valve for rock 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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Pressure relief valve for roller bit

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

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Protected lubricant reservoir for sealed bearing earth...

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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Protected lubricant reservoir for sealed earth boring 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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