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公开(公告)号：US3078566A
公开(公告)日：1963-02-26
申请号：US65624657
申请日：1957-05-01
Applicant: COLD FORMING MFG COMPANY
Inventor： EGAN FRANCIS J
IPC: B21K21/00
CPC classification number: B21K21/00
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公开(公告)号：US2715232A
公开(公告)日：1955-08-16
申请号：US16833650
申请日：1950-06-15
Applicant: COLD FORMING MFG COMPANY
Inventor： EGAN FRANCIS J
IPC: B21J13/14
CPC classification number: B21J13/14 , Y10T83/2135
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