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公开(公告)号：US3081813A
公开(公告)日：1963-03-19
申请号：US81239259
申请日：1959-05-11
Applicant: ACME STEEL CO
Inventor： ANDERSON DOUGLAS O , HALL ROBERT M
IPC: B21C37/12
CPC classification number: B21C37/126
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