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公开(公告)号：US2944502A
公开(公告)日：1960-07-12
申请号：US46048354
申请日：1954-10-05
Applicant: LEMMERZ WERKE G M B H FA
Inventor： PAUL LEMMERZ
IPC: B21D53/30
CPC classification number: B21D53/30 , Y10T29/49529
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