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Mobile elevating oil platform for offshore drilling with a mechanism which is useful as, or as a crane boretaarn
Mobile elevating oil platform for offshore drilling with a mechanism which is useful as, or as a crane boretaarn
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机译:用于海上钻井的移动式举升石油平台,其机械装置可用作或用作起重机钻孔
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摘要
This invention relates to a mobile drilling platform of the jack-up type equipped with a special system which allows the said drilling platform to work as a drilling derrick and alternatively as a hoisting crane rig for marine service.
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