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a stopper element riimpiegabile act to lock the tube holder held of drilling platform for offshore oil wells
a stopper element riimpiegabile act to lock the tube holder held of drilling platform for offshore oil wells
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机译:止动元件riimpiegabile动作,用于锁定海上石油钻井平台所支撑的管架
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摘要
A reusable plug for sealing the conductor pipe of offshore platforms comprising a cylindrical housing, central body member, pressure equalization means and retractable release means releasably securing the central body member to the cylindrical housing.
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