Kertong na-ekwupụta nke ọma na anyị na-emepụta naanị ihuenyo nnọchi mana ọ bụghị nke mbụ.Derrock, FLC, Hyperpool, PWP, Ihuenyo Wave bụ akara nke ụlọ ọrụ Derrock.NOV Brandt, VSM, Cobra, King Cobra, D380, D285P na LCM bụ akara nke Varco I/P, Inc. MI SWACO, ALS-2, MD-2, MD-3, MEERKAT PT, ...
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