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公开(公告)号：US2115996A
公开(公告)日：1938-05-03
申请号：US11914237
申请日：1937-01-05
Applicant: GEORGE I BIGGS
Inventor： MCKENNEY WILLIAM R
IPC: B63C7/26
CPC classification number: B63C7/26 , B63B2201/04
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