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公开(公告)号：US1831689A
公开(公告)日：1931-11-10
申请号：US3524725
申请日：1925-06-05
Applicant: BECKWITH MFG CO
Inventor： SWETT CHARLES E
IPC: A43B23/08
CPC classification number: A43B23/086 , Y10T428/31801 , Y10T428/31815 , Y10T442/2098 , Y10T442/2361
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