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An Entity of Type : prov:Entity, within Data Space : webisadb.webdatacommons.org associated with source dataset(s)

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  • A ball retainer element 433 encapsulates the upper ball 430 at its lowermost end and is maintained in position with the upper cage segment retainer 447A through a securing shoulder 433A, a passage 434 being defined through the retainer 433 to permit pumping of mud or other well killing fluids across the upper ball 430, while the ball is closed, if this procedure is desirable.
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