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公开(公告)号：US3181440A
公开(公告)日：1965-05-04
申请号：US17989962
申请日：1962-03-15
Applicant: SMITH CORP A O
Inventor： MULLANEY NORBERT F , CARLTON CHESTER P
IPC: B21D47/00
CPC classification number: B21D47/005
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