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公开(公告)号：US2919833A
公开(公告)日：1960-01-05
申请号：US70471157
申请日：1957-12-23
Applicant: STANLEY AXELROD DR
Inventor： LOUIS WOLSHIN
IPC: B63C9/19
CPC classification number: B63C9/24 , Y10T137/1632 , Y10T137/1767
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