4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Tool advance causing or controlling means

Xinyi Gu

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Ring rack oil pumping machine

Pumps – Expansible chamber type – Fluid serially moved to opposite side of pumping member
Reexamination Certificate

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Well rig lift system and a hydraulic energy-storing well rig lif

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Profile ID: LFUS-PAI-P-1748486

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