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公开(公告)号：US2933124A
公开(公告)日：1960-04-19
申请号：US56045556
申请日：1956-01-20
Applicant: KRONPRINZ AG
Inventor： ERIC BENSON WATKIN , ERIC BENSON GORDON
IPC: B21D53/30
CPC classification number: B21D53/30
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