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公开(公告)号:US3268220A
公开(公告)日:1966-08-23
申请号:US33573064
申请日:1964-01-06
Applicant: DRO ENGINEERING COMPANY DI
Inventor: WILLIAMSON FLOYD M
CPC classification number: B21D24/02 , B30B1/26 , Y10T137/7766
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公开(公告)号:US3205742A
公开(公告)日:1965-09-14
申请号:US29442763
申请日:1963-07-11
Applicant: DRO ENGINEERING COMPANY DI
Inventor: WILLIAMSON FLOYD M
IPC: B21D28/34
CPC classification number: B21D28/34 , Y10T83/2159 , Y10T83/8785 , Y10T83/9428 , Y10T83/9476
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公开(公告)号:US3147723A
公开(公告)日:1964-09-08
申请号:US11243961
申请日:1961-05-24
Applicant: DRO ENGINEERING COMPANY DI
Inventor: WILLIAMSON FLOYD M
IPC: B21D24/02
CPC classification number: B21D24/02 , Y10T137/7766
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