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公开(公告)号：US2592971A
公开(公告)日：1952-04-15
申请号：US4648848
申请日：1948-08-27
Applicant: HARRY STEWART
Inventor： HARRY STEWART
IPC: A63H27/04
CPC classification number: A63H27/04 , Y10T74/18976
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