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公开(公告)号：US1532856A
公开(公告)日：1925-04-07
申请号：US74409724
申请日：1924-10-17
Applicant: SMITH CORP A O
Inventor： ANDREN BIRGER T , JOHN DILOT
IPC: B21D24/16
CPC classification number: B21D24/16 , Y10T74/2151
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