4. Wells
  5. Above ground apparatus
  6. With seal for reciprocating member
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Environmental leakage protector for recirocating rod fluid displ

Wells – Above ground apparatus – With seal for reciprocating member
Patent

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Environmentally secure polished rod liner head

Wells – Above ground apparatus – With seal for reciprocating member
Patent

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Extended wear ball lock for rotating head

Wells – Above ground apparatus – With seal for reciprocating member
Reexamination Certificate

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