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公开(公告)号：US3459026A
公开(公告)日：1969-08-05
申请号：US3459026D
申请日：1967-07-28
Applicant: STANRAY CORP
Inventor： ALLEN JOHN W , HACHLER WESLEY R
CPC classification number: B21D31/04 , Y10T29/185 , Y10T29/496
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