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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Apparatus for excavating bore holes in rock

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

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Borehole drilling apparatus

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

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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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Method of drilling a well at or under balance using a...

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

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Pulse rate of penetration enhancement device and method

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

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Static separator sub

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

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