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公开(公告)号：US2261513A
公开(公告)日：1941-11-04
申请号：US30348039
申请日：1939-11-08
Applicant: THOMAS DONNERSTOG
Inventor： THOMAS DONNERSTOG
CPC classification number: B63B22/06 , B63B22/24 , B63B2201/16 , B63B2205/08
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