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公开(公告)号：US1530388A
公开(公告)日：1925-03-17
申请号：US52980722
申请日：1922-01-16
Applicant: WILLIAMS STEEL WHEEL & RIM CO
Inventor： MENGE CHARLES F
IPC: B21D53/30
CPC classification number: B21D53/30 , Y10T29/49531
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