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公开(公告)号：US3345844A
公开(公告)日：1967-10-10
申请号：US42972465
申请日：1965-02-02
Applicant: GEN DYNAMICS CORP
Inventor： HANSJORG JANSEN , PAUL WILDI
IPC: B21D26/14
CPC classification number: B21D26/14
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