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公开(公告)号：US2711204A
公开(公告)日：1955-06-21
申请号：US19299650
申请日：1950-10-30
Applicant: GEN MOTORS CORP
Inventor： FRANK BERNARD E , CUMMINGS FREDERICK C
IPC: B21D11/07
CPC classification number: B21D11/07
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