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公开(公告)号：US2952294A
公开(公告)日：1960-09-13
申请号：US73658358
申请日：1958-05-20
Applicant: NAT RES DEV
Inventor： BEVERLEY GRAHAM E , WALLACE JOHN F
IPC: B21D11/02
CPC classification number: B21D11/02
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