4. Boring or penetrating the earth
  5. With storage means for bit lubricant carried by bit or shaft
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Sealed and lubricated rock bit with air protected seal ring

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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Sealed lubricated and air cooled rock bit bearing

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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Sealing structure for a rock 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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Self compensating seal apparatus

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

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Self-lubricating well tools and seal elements 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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Stabilized conical boring tool

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

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