4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
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Dart-operated big bore by-pass valve

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

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Device and procedure for the insertion of a new drilling...

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

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Device for reversing the direction of flow of a fluid at the lev

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

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Downhole valve for oil/gas well

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

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Downhole valve for use when drilling an oil or gas well

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

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Drill bit having springless check valve and method of blocking b

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

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Drill pipe

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

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