4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
  6. Valve prevents upward flow
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Reverse circulation bit apparatus

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow
Patent

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Reverse circulation directional and horizontal drilling...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow
Reexamination Certificate

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