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公开(公告)号：US2180869A
公开(公告)日：1939-11-21
申请号：US13401937
申请日：1937-03-31
Applicant: GAY JOSEPH S
Inventor： GAY JOSEPH S
IPC: B21D28/18
CPC classification number: B21D28/18 , Y10T83/06 , Y10T83/2163 , Y10T83/8855
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