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公开(公告)号：US3077221A
公开(公告)日：1963-02-12
申请号：US13440261
申请日：1961-08-28
Applicant: IMP EASTMAN CORP
Inventor： FRANCK GEORGE E , ROWE CHARLES L
IPC: B21D7/06
CPC classification number: B21D7/063
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