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公开(公告)号：US2999149A
公开(公告)日：1961-09-05
申请号：US77392958
申请日：1958-11-14
Applicant: COOK JR HERBERT ALTON
Inventor： COOK JR HERBERT ALTON
IPC: B63B45/00
CPC classification number: B63B45/00 , B63B45/04 , B63B2201/08 , G08G3/00
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