4. Wells
  5. With below and above ground modification
  6. Head for tool, piston or cleaner
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Adjustable cement head manifold

Wells – With below and above ground modification – Head for tool – piston or cleaner
Patent

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Apparatus for dropping articles downhole

Wells – With below and above ground modification – Head for tool – piston or cleaner
Reexamination Certificate

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Apparatus for injecting displacement plugs

Wells – With below and above ground modification – Head for tool – piston or cleaner
Patent

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Apparatus for releasing a cementing plug

Wells – With below and above ground modification – Head for tool – piston or cleaner
Patent

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