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1.发明授权
公开(公告)号：US3397560A
公开(公告)日：1968-08-20
申请号：US55613166
申请日：1966-06-08
Applicant: CEFILAC
Inventor： KAPRELIAN ROBERT A
IPC: B21C23/32
CPC classification number: B21C23/32
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