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公开(公告)号：US3169156A
公开(公告)日：1965-02-09
申请号：US7811760
申请日：1960-12-23
Applicant: GEN DYNAMICS CORP
Inventor： JOHNSON ROBERT E , MCCLINTICK RICHARD J
CPC classification number: B21D11/02 , C22F1/00 , Y10S266/905
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