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  5. Guide for device or conduit
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Method and apparatus for running a mechanical roller arm central

Wells – Guide for device or conduit – On sucker or pump rod
Patent

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Method of making a centering device and centering device...

Wells – Guide for device or conduit – Surrounding existing device or tubing
Reexamination Certificate

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Minimum clearance bow-spring centralizer

Wells – Guide for device or conduit – On sucker or pump rod
Reexamination Certificate

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Multi-purpose adjustable centralizer system with tool

Wells – Guide for device or conduit – Surrounding existing device or tubing
Patent

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