4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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Earth bit having a pressure relief valve

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

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Earth boring bit and lubricator compensation therefor

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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Earth boring bit and lubricator/compensator therefor

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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Earth boring bit packed lubrication system

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

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Earth boring bit with pin mounted compensator

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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Earth boring bit with pressure compensating rigid face seal

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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Earth boring bit with protected seal means

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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Earth drilling knobby 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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Encapsulated elastomeric relief valve

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

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