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Priority claimed from EP85108205Aexternal-prioritypatent/EP0175856B1/de
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Publication of ATE42999T1publicationCriticalpatent/ATE42999T1/de
Poco possuindo um membro interno tubular,poco submarino possuindo uma bucha de desgaste tubular,sistema de poco e processo de reter liberavelmente um membro interno tubular