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公开(公告)号：US2444931A
公开(公告)日：1948-07-13
申请号：US74366047
申请日：1947-04-24
Applicant: BECKWITH MFG CO
Inventor： HEATON WALTER H , VACCARO WILLIAM J
IPC: A43B23/08
CPC classification number: A43B23/086
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