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公开(公告)号：US3019894A
公开(公告)日：1962-02-06
申请号：US77349658
申请日：1958-11-12
Applicant: CEFILAC
Inventor： JEAN DELCROIX , RENE HUBERT , RENE HEINTZ
CPC classification number: B21C23/212 , B21C35/04
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