4. Wells
  5. Packers or plugs
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Apparatus for well treating

Wells – Packers or plugs – With detachable setting means
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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Arrangement to prevent premature expansion of expandable seal me

Wells – Packers or plugs – Central support has shoulders expanding sealing portion – or...
Patent

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Attachment means for use for insertion and retrieval of a casing

Wells – Packers or plugs – With expanding anchor
Patent

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