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公开(公告)号：US1373572A
公开(公告)日：1921-04-05
申请号：US35698520
申请日：1920-02-07
Applicant: SMITH CORP A O
Inventor： STANLEY SMITH REUBEN , ANDREN BIRGER T , HENRY MILLER
IPC: B21D24/00
CPC classification number: B21D24/00
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