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1.发明授权
公开(公告)号：US2875511A
公开(公告)日：1959-03-03
申请号：US50443455
申请日：1955-04-28
Applicant: HAWES TURNER C
Inventor： HAWES TURNER C
IPC: B21D22/20
CPC classification number: B21D35/006 , B21D22/201 , Y10T428/12243 , Y10T428/12389
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