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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Mechanism for lubricating the bearings of the cutting rollers of

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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Method and apparatus for well drilling

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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Methods and apparatus for lubricating a rotary cutter

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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Modular 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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