4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
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Method and apparatus for cementing drill strings in place for on

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

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Method and apparatus for cementing drill strings in place...

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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Methods and apparatus for cementing drill strings in place...

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Methods and apparatus for cementing drill strings in place...

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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