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Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus and instruments for inspection, testing and monitoring of drilling equipment, downhole functions, pressure, fluids, gas, including communication between installations for well drilling; electronic and scientific apparatus and devices for use in petroleum engineering; electrical apparatus for use in the field of petroleum engineering; annulus monitoring and lockdown...
Abandoned · April 21, 2021 · 79332981 ·