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公开(公告)号：US2067239A
公开(公告)日：1937-01-12
申请号：US70713934
申请日：1934-01-18
Applicant: BECKWITH MFG CO
Inventor： MAYO WINTHROP M , LOVELL STANLEY P
IPC: A43B23/08
CPC classification number: A43B23/086 , Y10T428/23986
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