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公开(公告)号：US2434379A
公开(公告)日：1948-01-13
申请号：US56845444
申请日：1944-12-16
Applicant: GLENN L MARTIN CO
Inventor： WIESNER FRANK W , ALEXANDER COULTER
IPC: B21D11/02
CPC classification number: B21D11/02 , Y10S264/50
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