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公开(公告)号：US3227022A
公开(公告)日：1966-01-04
申请号：US5598860
申请日：1960-09-14
Applicant: AJEM LAB INC
Inventor： EVANS DEWEY M , WHITEHEAD JAMES A
IPC: B21D28/24
CPC classification number: B21D28/24 , Y10T83/8699 , Y10T83/8743 , Y10T83/8835 , Y10T83/8858 , Y10T83/9476
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