4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
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One pass drilling and completion of extended reach lateral...

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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One pass drilling and completion of wellbores with drill bit att

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

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One-way drill string clutch

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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Overflow valve of drill string

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

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