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公开(公告)号：US3181334A
公开(公告)日：1965-05-04
申请号：US18013262
申请日：1962-03-16
Applicant: SMITH CORP A O
Inventor： MATTSON RICHARD E , WINSTROM BERTIL G
IPC: B21C35/02
CPC classification number: B21C35/02
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