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公开(公告)号：US3253442A
公开(公告)日：1966-05-31
申请号：US28303363
申请日：1963-05-24
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： GROVE JR LOUIS C , INNIS ROBERT T
IPC: B21D26/12
CPC classification number: B21D26/12
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