TREA

The Science & Technic Department of Dagang Petroleum Administration

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  • Tien Jing, CN
Organizations

Patents Grantslast 30 patents

  • Information Patent Grant

    Device for clamping drill pipe and the like in mouse hole pipe
    • Patent number 4,756,538
    • Issue date Jul 12, 1988
    • The Science and Technic Department of Dagang Petroleum Administration
    • Chen Yuehui
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Supercharged power tongs
    • Patent number 4,727,781
    • Issue date Mar 1, 1988
    • The Science & Technic Department of Dagang Petroleum Administration
    • Chen Yuehui
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

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