4. Wells
  5. Packers or plugs
  6. Flow stopping type; e.g., plug
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Apparatus for releasing a ball into a wellbore

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Reexamination Certificate

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Apparatus for sealing a well casing

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Patent

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Apparatus for well treating

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Patent

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Arrangement of test plug

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Reexamination Certificate

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