4. Wells
  5. With below and above ground modification
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Manifold arrangement for use with a top drive power unit

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

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Mechanism for dropping a plurality of balls into tubulars...

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

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Multi-port cementing head

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

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