4. Boring or penetrating the earth
  5. With means movable relative to tool below ground to stop...
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Method and apparatus for adding a tubular to drill string...

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – Stops flow by movement about fixed pivot
Reexamination Certificate

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Method of and apparatus for crushing earth under the ground

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – Stops flow by movement about fixed pivot
Patent

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