4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
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Ball actuable circulating dump valve

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

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Ball operated by-pass tool for use in drillstring

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

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Blowout preventer

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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