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公开(公告)号：US3463046A
公开(公告)日：1969-08-26
申请号：US3463046D
申请日：1967-12-11
Applicant: EMHART CORP
Inventor： WELCH NICHOLAS A , WENDT HARRY C
CPC classification number: B21K1/60 , B21J15/043 , F16B19/1054 , F16B19/1072 , Y10S411/967 , Y10T29/49917 , Y10T29/49929 , Y10T29/4994 , Y10T29/49956
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