Kertong atangaza cyane ko dukora gusa ecran zo gusimbuza ariko atari izumwimerere.Derrock, FLC, Hyperpool, PWP, Wave Screen ni ibimenyetso bya Derrock Corporation.NOV Brandt, VSM, Cobra, King Cobra, D380, D285P na LCM ni ibimenyetso bya Varco I / P, Inc. MI SWACO, ALS-2, MD-2, MD-3, MEERKAT PT, ...
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