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公开(公告)号：US3119293A
公开(公告)日：1964-01-28
申请号：US14589161
申请日：1961-10-18
Applicant: WESTERN ELECTRIC CO
Inventor： ALLEN DELBERT R , BROSSEIT FRITZ V
IPC: B21D45/00
CPC classification number: B21D45/00 , Y10T83/214 , Y10T83/2159
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