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公开(公告)号：US2928164A
公开(公告)日：1960-03-15
申请号：US56567056
申请日：1956-02-15
Applicant: SPAN JOHN J
Inventor： SPAN JOHN J
IPC: B21C43/04
CPC classification number: B21C43/04 , Y10T29/4517
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