Chungiao Ren

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Shanghai, CN

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Patents Applicationslast 30 patents

Information Patent Application
DRILLING RIG MASTS AND METHODS OF ASSEMBLY AND ERECTION
- Publication number 20150059262
- Publication date Mar 5, 2015
- National Oilwell Varco, L.P.
- Robert Benjamin Donnally
- E21 - EARTH DRILLING MINING