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

Drumco

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Drill bit and drill assembly

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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Drill bit assembly

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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Drill bit assembly having improved operational life

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Method and apparatus for lubricating a drill bit

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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