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公开(公告)号：US2538917A
公开(公告)日：1951-01-23
申请号：US2797448
申请日：1948-05-19
Applicant: COMPTOIR IND ETIRAGE
Inventor： JACQUES SEJOURNET , LOUIS LABATAILLE
IPC: B21C23/32
CPC classification number: B21C23/32 , Y10T29/4981 , Y10T29/49812
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