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公开(公告)号：US3103018A
公开(公告)日：1963-09-10
申请号：US3091060
申请日：1960-05-23
Applicant: RAND DEV CORP
Inventor： DEWITT ELDRED
IPC: B63B5/24
CPC classification number: B63B5/24 , Y10T428/249942
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