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公开(公告)号：JPS6344918B2
公开(公告)日：1988-09-07
申请号：JP6682081
申请日：1981-05-01
Applicant: CONOCO INC
Inventor： RIREI JEN GOORUDOSUMISU
IPC: B63B35/44 , E21B7/128 , E21B15/02 , E21B43/01 , E21B43/017
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