4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Means other than tool structure to induce fluent flow
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Device for removing drillhole debris

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Patent

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Downhole centrifugal drilling fluid separator

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Reexamination Certificate

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Downhole centrifugal drilling fluid separator

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Reexamination Certificate

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Drill pipe joint

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Patent

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