4. Electricity: measuring and testing
  5. Of geophysical surface or subsurface in situ
  6. Including borehole fluid investigation

Qingyan He

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Sensor and insulation layer structure for well logging...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation
Reexamination Certificate

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Wellbore communication system

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2206920

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