Kertong akulengeza kuti timangopanga zowonetsera koma osati zoyambirira.Derrock, FLC, Hyperpool, PWP, Wave Screen ndi zilembo za Derrock Corporation.NOV Brandt, VSM, Cobra, King Cobra, D380, D285P ndi LCM ndi zizindikiro za Varco I/P, Inc. MI SWACO, ALS-2, MD-2, MD-3, MEERKAT PT, ...
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