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公开(公告)号：US1704901A
公开(公告)日：1929-03-12
申请号：US15237126
申请日：1926-12-03
Applicant: RICHMOND FIREPROOF DOOR COMPAN
Inventor： PEELLE CHARLES W
IPC: B66B13/30
CPC classification number: B66B13/303
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