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1.发明授权
公开(公告)号：US2991740A
公开(公告)日：1961-07-11
申请号：US70759058
申请日：1958-01-07
Applicant: WILHELM ECKHARDT
Inventor： WILHELM ECKHARDT
IPC: B21C37/12
CPC classification number: B21C37/12
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