Kerting o phatlalatsa ka tieo hore re hlahisa li-skrini tse ncha feela empa eseng tsa mantlha.Derrock, FLC, Hyperpool, PWP, Wave Screen ke matšoao a Derrock Corporation.NOV Brandt, VSM, Cobra, King Cobra, D380, D285P le LCM ke matšoao a Varco I/P, Inc. MI SWACO, ALS-2, MD-2, MD-3, MEERKAT PT, ...
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