4. Wells
  5. Valves, closures or changeable restrictors
  6. Operated by dropped element
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Downhole circulation valve operated by dropping balls

Wells – Valves – closures or changeable restrictors – Operated by dropped element
Reexamination Certificate

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Downhole surge tools

Wells – Valves – closures or changeable restrictors – Operated by dropped element
Patent

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Drop ball catcher apparatus

Wells – Valves – closures or changeable restrictors – Operated by dropped element
Reexamination Certificate

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