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公开(公告)号：US3287948A
公开(公告)日：1966-11-29
申请号：US29079863
申请日：1963-06-26
Applicant: NAT RES DEV
Inventor： MALCOLM ALEXANDER JOHN , BELA LENGYEL
IPC: B21K23/04
CPC classification number: B21K23/04
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