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Priority to JP7218871ApriorityCriticalpatent/JPS5033962B2/ja
Publication of JPS4838203ApublicationCriticalpatent/JPS4838203A/ja
Publication of JPS5033962B2publicationCriticalpatent/JPS5033962B2/ja
Method and apparatus for determining onboard a heaving vessel the flow rate of drilling fluid flowing out of a wellhole and into a telescoping marine riser connecting between the wellhouse and the vessel