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公开(公告)号：US3099976A
公开(公告)日：1963-08-06
申请号：US2345360
申请日：1960-04-20
Applicant: WATSON D HARBAUGH
Inventor： SCHWANEKE FRED C , SHEEHAN EDMUND J
IPC: B63B15/02
CPC classification number: B63B15/02
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