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公开(公告)号：US2240567A
公开(公告)日：1941-05-06
申请号：US29991839
申请日：1939-10-18
Applicant: STANDARD OIL DEV CO
Inventor： MEACHAM MERLE R , OTTO LESSING
CPC classification number: E02B15/08 , B63B25/082 , E02B15/0814 , E02B15/0828 , E02B15/0864
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