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公开(公告)号：US1646533A
公开(公告)日：1927-10-25
申请号：US10399326
申请日：1926-04-22
Applicant: RICHMOND FIREPROOF DOOR COMPAN
Inventor： HEWITT WALTER B
IPC: B21D49/00
CPC classification number: B21D49/00
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