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公开(公告)号：US3431759A
公开(公告)日：1969-03-11
申请号：US3431759D
申请日：1966-02-02
Applicant: WALKER MFG CO
Inventor： KIDERA EDWARD H , KURTH WARREN , WHITTINGHAM DAVID J
CPC classification number: B21D7/06
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