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公开(公告)号：US3135098A
公开(公告)日：1964-06-02
申请号：US15000261
申请日：1961-11-03
Applicant: R U D A INC
Inventor： ROOT FRANK E
IPC: B63C11/08
CPC classification number: B63C11/08 , Y10S224/934
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