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公开(公告)号：US3504921A
公开(公告)日：1970-04-07
申请号：US3504921D
申请日：1968-04-08
Applicant: LAWRENCE R OSMOND
Inventor： OSMOND LAWRENCE R
CPC classification number: A63C11/026 , B60R9/12 , B62B5/00 , B62B19/02 , B62B2202/401
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