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公开(公告)号：US2893555A
公开(公告)日：1959-07-07
申请号：US57813756
申请日：1956-04-13
Applicant: COMPTOIR IND ETIRAGE
Inventor： JEAN BUFFET , JOSEPH MERIAUX
IPC: B21C23/32
CPC classification number: B21C23/32
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