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公开(公告)号：US1602636A
公开(公告)日：1926-10-12
申请号：US2695125
申请日：1925-04-30
Applicant: RICHMOND FIREPROOF DOOR COMPAN
Inventor： BALL HALLACK C , WINDER JOSEPH Z
IPC: B66B13/20
CPC classification number: B66B13/20
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