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公开(公告)号：US3475902A
公开(公告)日：1969-11-04
申请号：US3475902D
申请日：1968-07-10
Applicant: WESSEL PAUL
Inventor： WESSEL PAUL
CPC classification number: B63C11/32 , G04B19/28 , G04B47/061
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