Kertong sọ ni gbangba pe a gbejade awọn iboju rirọpo nikan ṣugbọn kii ṣe awọn atilẹba.Derrock, FLC, Hyperpool, PWP, Iboju igbi jẹ awọn ami ti Derrock Corporation.NOV Brandt, VSM, Cobra, King Cobra, D380, D285P ati LCM jẹ awọn ami ti Varco I/P, Inc. MI SWACO, ALS-2, MD-2, MD-3, MEERKAT PT, ...
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